diff --git a/app/controllers/settings/preferences_controller.rb b/app/controllers/settings/preferences_controller.rb
index 3b69e31ce..af2d51650 100644
--- a/app/controllers/settings/preferences_controller.rb
+++ b/app/controllers/settings/preferences_controller.rb
@@ -95,6 +95,7 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_confirm_follow_from_bot,
       :setting_default_search_searchability,
       :setting_show_reload_button,
+      :setting_default_column_width,
       notification_emails: %i(follow follow_request reblog favourite emoji_reaction status_reference mention digest report pending_account trending_tag),
       interactions: %i(must_be_follower must_be_following must_be_following_dm must_be_dm_to_send_email must_be_following_reference)
     )
diff --git a/app/javascript/mastodon/components/column.js b/app/javascript/mastodon/components/column.js
index 239824a4f..48c952c7a 100644
--- a/app/javascript/mastodon/components/column.js
+++ b/app/javascript/mastodon/components/column.js
@@ -2,6 +2,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { supportsPassiveEvents } from 'detect-passive-events';
 import { scrollTop } from '../scroll';
+import classNames from 'classnames';
 
 export default class Column extends React.PureComponent {
 
@@ -9,6 +10,7 @@ export default class Column extends React.PureComponent {
     children: PropTypes.node,
     label: PropTypes.string,
     bindToDocument: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   scrollTop () {
@@ -50,10 +52,10 @@ export default class Column extends React.PureComponent {
   }
 
   render () {
-    const { label, children } = this.props;
+    const { label, columnWidth, children } = this.props;
 
     return (
-      <div role='region' aria-label={label} className='column' ref={this.setRef}>
+      <div role='region' aria-label={label} className={classNames('column', columnWidth)} ref={this.setRef}>
         {children}
       </div>
     );
diff --git a/app/javascript/mastodon/components/column_header.js b/app/javascript/mastodon/components/column_header.js
index 6fd4f042c..8cae25aa2 100644
--- a/app/javascript/mastodon/components/column_header.js
+++ b/app/javascript/mastodon/components/column_header.js
@@ -1,10 +1,11 @@
 import React from 'react';
+import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
 import { createPortal } from 'react-dom';
 import classNames from 'classnames';
 import { FormattedMessage, injectIntl, defineMessages } from 'react-intl';
 import Icon from 'mastodon/components/icon';
-import { enableEmptyColumn } from 'mastodon/initial_state';
+import { enableEmptyColumn, defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   show: { id: 'column_header.show_settings', defaultMessage: 'Show settings' },
@@ -13,7 +14,20 @@ const messages = defineMessages({
   moveRight: { id: 'column_header.moveRight_settings', defaultMessage: 'Move column to the right' },
 });
 
-export default @injectIntl
+const column_width_message = [
+  { id: 'x080', defaultMessage: <FormattedMessage id={'column_width.x080'} defaultMessage='80%' /> },
+  { id: 'x100', defaultMessage: <FormattedMessage id={'column_width.x100'} defaultMessage='100%' /> },
+  { id: 'x125', defaultMessage: <FormattedMessage id={'column_width.x125'} defaultMessage='125%' /> },
+  { id: 'x150', defaultMessage: <FormattedMessage id={'column_width.x150'} defaultMessage='150%' /> },
+  { id: 'free', defaultMessage: <FormattedMessage id={'column_width.free'} defaultMessage='Free' /> },
+];
+
+const mapStateToProps = (state, { columnWidth }) => ({
+  columnWidth: columnWidth ?? defaultColumnWidth,
+});
+
+export default @connect(mapStateToProps)
+@injectIntl
 class ColumnHeader extends React.PureComponent {
 
   static contextTypes = {
@@ -36,6 +50,8 @@ class ColumnHeader extends React.PureComponent {
     onClick: PropTypes.func,
     appendContent: PropTypes.node,
     collapseIssues: PropTypes.bool,
+    columnWidth: PropTypes.string,
+    onWidthChange: PropTypes.func,
   };
 
   state = {
@@ -88,8 +104,15 @@ class ColumnHeader extends React.PureComponent {
     this.props.onPin();
   }
 
+  handleChangeWidth = e => {
+    e.stopPropagation();
+    if (this.props.onWidthChange) {
+      this.props.onWidthChange(e.target.value);
+    }
+  }
+
   render () {
-    const { title, icon, active, children, pinned, multiColumn, extraButton, showBackButton, intl: { formatMessage }, placeholder, appendContent, collapseIssues } = this.props;
+    const { title, icon, active, children, pinned, multiColumn, extraButton, showBackButton, intl: { formatMessage }, placeholder, appendContent, collapseIssues, columnWidth } = this.props;
     const { collapsed, animating } = this.state;
 
     const wrapperClassName = classNames('column-header__wrapper', {
@@ -146,11 +169,25 @@ class ColumnHeader extends React.PureComponent {
       );
     }
 
+    const widthButton = (
+      <div className='column-settings__row' role='group' key='column-width'>
+        <div className='column-width' role='group'>
+          {column_width_message.map(({ id, defaultMessage }) => (
+            <label key={id} className={classNames('column-width__item', { active: columnWidth === id })}>
+              <input name='width' type='radio' value={id} checked={columnWidth === id} onChange={this.handleChangeWidth} />
+              {defaultMessage}
+            </label>
+          ))}
+        </div>
+      </div>
+    );
+
     const collapsedContent = [
       extraContent,
     ];
 
     if (multiColumn) {
+      collapsedContent.unshift(widthButton);
       collapsedContent.push(moveButtons);
       collapsedContent.push(pinButton);
     }
diff --git a/app/javascript/mastodon/features/account_conversations/index.js b/app/javascript/mastodon/features/account_conversations/index.js
index cdb3d26c2..0db121992 100644
--- a/app/javascript/mastodon/features/account_conversations/index.js
+++ b/app/javascript/mastodon/features/account_conversations/index.js
@@ -17,7 +17,8 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { fetchAccountIdentityProofs } from '../../actions/identity_proofs';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import TimelineHint from 'mastodon/components/timeline_hint';
-import { new_features_policy } from 'mastodon/initial_state';
+import { new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.account', defaultMessage: 'Account' },
@@ -36,6 +37,7 @@ const mapStateToProps = (state, { params: { accountId } }) => ({
   blockedBy: state.getIn(['relationships', accountId, 'blocked_by'], false),
   advancedMode: state.getIn(['settings', 'account', 'other', 'advancedMode'], new_features_policy === 'conservative' ? false : true),
   hideRelation: state.getIn(['settings', 'account', 'other', 'hideRelation'], false),
+  columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
 });
 
 const RemoteHint = ({ url }) => (
@@ -63,6 +65,7 @@ class AccountConversations extends ImmutablePureComponent {
     isAccount: PropTypes.bool,
     suspended: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -93,12 +96,16 @@ class AccountConversations extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { statusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, hideRelation, intl } = this.props;
+    const { statusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, hideRelation, columnWidth, intl } = this.props;
 
     if (!isAccount) {
       return (
@@ -128,7 +135,7 @@ class AccountConversations extends ImmutablePureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -136,6 +143,8 @@ class AccountConversations extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/account_gallery/index.js b/app/javascript/mastodon/features/account_gallery/index.js
index bcd30ed52..eb67fd3f7 100644
--- a/app/javascript/mastodon/features/account_gallery/index.js
+++ b/app/javascript/mastodon/features/account_gallery/index.js
@@ -16,8 +16,9 @@ import ScrollContainer from 'mastodon/containers/scroll_container';
 import LoadMore from 'mastodon/components/load_more';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import { openModal } from 'mastodon/actions/modal';
-import { new_features_policy } from 'mastodon/initial_state';
+import { new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.account', defaultMessage: 'Account' },
@@ -32,6 +33,7 @@ const mapStateToProps = (state, props) => ({
   blockedBy: state.getIn(['relationships', props.params.accountId, 'blocked_by'], false),
   advancedMode: state.getIn(['settings', 'account', 'other', 'advancedMode'], new_features_policy === 'conservative' ? false : true),
   hideRelation: state.getIn(['settings', 'account', 'other', 'hideRelation'], false),
+  columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
 });
 
 class LoadMoreMedia extends ImmutablePureComponent {
@@ -72,6 +74,7 @@ class AccountGallery extends ImmutablePureComponent {
     blockedBy: PropTypes.bool,
     suspended: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   state = {
@@ -140,12 +143,16 @@ class AccountGallery extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { attachments, isLoading, hasMore, isAccount, multiColumn, blockedBy, suspended, hideRelation, intl } = this.props;
+    const { attachments, isLoading, hasMore, isAccount, multiColumn, blockedBy, suspended, hideRelation, columnWidth, intl } = this.props;
     const { width } = this.state;
 
     if (!isAccount) {
@@ -179,7 +186,7 @@ class AccountGallery extends ImmutablePureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -187,6 +194,8 @@ class AccountGallery extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/account_timeline/index.js b/app/javascript/mastodon/features/account_timeline/index.js
index fc06893be..59a8023e7 100644
--- a/app/javascript/mastodon/features/account_timeline/index.js
+++ b/app/javascript/mastodon/features/account_timeline/index.js
@@ -17,9 +17,10 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { fetchAccountIdentityProofs } from '../../actions/identity_proofs';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import TimelineHint from 'mastodon/components/timeline_hint';
-import { me, new_features_policy } from 'mastodon/initial_state';
+import { me, new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
 import { connectTimeline, disconnectTimeline } from 'mastodon/actions/timelines';
 import { fetchFeaturedTags } from '../../actions/featured_tags';
+import { changeSetting } from '../../actions/settings';
 
 const emptyList = ImmutableList();
 
@@ -54,6 +55,7 @@ const mapStateToProps = (state, { params: { accountId, tagged }, about, withRepl
     withoutReblogs,
     showPostsInAbout,
     hideRelation,
+    columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
   };
 };
 
@@ -90,6 +92,7 @@ class AccountTimeline extends ImmutablePureComponent {
     remote: PropTypes.bool,
     remoteUrl: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   static defaultProps = {
@@ -169,12 +172,16 @@ class AccountTimeline extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { intl, statusIds, featuredStatusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, remote, remoteUrl, about, withReplies, posts, advancedMode, hideFeaturedTags, showPostsInAbout, hideRelation } = this.props;
+    const { intl, statusIds, featuredStatusIds, isLoading, hasMore, blockedBy, suspended, isAccount, multiColumn, remote, remoteUrl, about, withReplies, posts, advancedMode, hideFeaturedTags, showPostsInAbout, hideRelation, columnWidth } = this.props;
 
     if (!isAccount) {
       return (
@@ -210,7 +217,7 @@ class AccountTimeline extends ImmutablePureComponent {
     const remoteMessage = (!about && remote) ? <RemoteHint url={remoteUrl} /> : null;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -218,6 +225,8 @@ class AccountTimeline extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/blocks/index.js b/app/javascript/mastodon/features/blocks/index.js
index 7ec177434..b66b0c00f 100644
--- a/app/javascript/mastodon/features/blocks/index.js
+++ b/app/javascript/mastodon/features/blocks/index.js
@@ -11,6 +11,7 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import AccountContainer from '../../containers/account_container';
 import { fetchBlocks, expandBlocks } from '../../actions/blocks';
 import ScrollableList from '../../components/scrollable_list';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.blocks', defaultMessage: 'Blocked users' },
@@ -20,6 +21,7 @@ const mapStateToProps = state => ({
   accountIds: state.getIn(['user_lists', 'blocks', 'items']),
   hasMore: !!state.getIn(['user_lists', 'blocks', 'next']),
   isLoading: state.getIn(['user_lists', 'blocks', 'isLoading'], true),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -34,6 +36,7 @@ class Blocks extends ImmutablePureComponent {
     isLoading: PropTypes.bool,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -45,7 +48,7 @@ class Blocks extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, accountIds, hasMore, multiColumn, isLoading } = this.props;
+    const { intl, accountIds, hasMore, multiColumn, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -58,7 +61,7 @@ class Blocks extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.blocks' defaultMessage="You haven't blocked any users yet." />;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='ban' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='ban' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <ScrollableList
           scrollKey='blocks'
diff --git a/app/javascript/mastodon/features/bookmarked_statuses/index.js b/app/javascript/mastodon/features/bookmarked_statuses/index.js
index cf067d954..cf9e3971e 100644
--- a/app/javascript/mastodon/features/bookmarked_statuses/index.js
+++ b/app/javascript/mastodon/features/bookmarked_statuses/index.js
@@ -10,16 +10,27 @@ import StatusList from '../../components/status_list';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   heading: { id: 'column.bookmarks', defaultMessage: 'Bookmarks' },
 });
 
-const mapStateToProps = state => ({
-  statusIds: state.getIn(['status_lists', 'bookmarks', 'items']),
-  isLoading: state.getIn(['status_lists', 'bookmarks', 'isLoading'], true),
-  hasMore: !!state.getIn(['status_lists', 'bookmarks', 'next']),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'bookmarked_statuses', 'columnWidth']);
+
+  return {
+    statusIds: state.getIn(['status_lists', 'bookmarks', 'items']),
+    isLoading: state.getIn(['status_lists', 'bookmarks', 'isLoading'], true),
+    hasMore: !!state.getIn(['status_lists', 'bookmarks', 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -31,6 +42,7 @@ class Bookmarks extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
   };
@@ -66,14 +78,24 @@ class Bookmarks extends ImmutablePureComponent {
     this.props.dispatch(expandBookmarkedStatuses());
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['bookmarked_statuses', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.bookmarked_statuses' defaultMessage="You don't have any bookmarked toots yet. When you bookmark one, it will show up here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='bookmark'
           title={intl.formatMessage(messages.heading)}
@@ -82,6 +104,8 @@ class Bookmarks extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           showBackButton
         />
 
diff --git a/app/javascript/mastodon/features/circles/index.js b/app/javascript/mastodon/features/circles/index.js
index 2c1329f3d..a621e9c5b 100644
--- a/app/javascript/mastodon/features/circles/index.js
+++ b/app/javascript/mastodon/features/circles/index.js
@@ -13,6 +13,7 @@ import NewCircleForm from './components/new_circle_form';
 import Circle from './components/circle';
 import { createSelector } from 'reselect';
 import ScrollableList from '../../components/scrollable_list';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.circles', defaultMessage: 'Circles' },
@@ -29,6 +30,7 @@ const getOrderedCircles = createSelector([state => state.get('circles')], circle
 
 const mapStateToProps = state => ({
   circles: getOrderedCircles(state),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -41,6 +43,7 @@ class Circles extends ImmutablePureComponent {
     circles: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -48,7 +51,7 @@ class Circles extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, circles, multiColumn } = this.props;
+    const { intl, circles, multiColumn, columnWidth } = this.props;
 
     if (!circles) {
       return (
@@ -61,7 +64,7 @@ class Circles extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.circles' defaultMessage="You don't have any circles yet. When you create one, it will show up here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='user-circle' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='user-circle' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
 
         <NewCircleForm />
diff --git a/app/javascript/mastodon/features/direct_timeline/index.js b/app/javascript/mastodon/features/direct_timeline/index.js
index 68523666c..62191623c 100644
--- a/app/javascript/mastodon/features/direct_timeline/index.js
+++ b/app/javascript/mastodon/features/direct_timeline/index.js
@@ -8,12 +8,25 @@ import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { connectDirectStream } from '../../actions/streaming';
 import ConversationsListContainer from './containers/conversations_list_container';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.direct', defaultMessage: 'Direct messages' },
 });
 
-export default @connect()
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'direct', 'columnWidth']);
+
+  return {
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
+export default @connect(mapStateToProps)
 @injectIntl
 class DirectTimeline extends React.PureComponent {
 
@@ -23,6 +36,7 @@ class DirectTimeline extends React.PureComponent {
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   handlePin = () => {
@@ -69,12 +83,22 @@ class DirectTimeline extends React.PureComponent {
     this.props.dispatch(expandConversations({ maxId }));
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['direct', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, hasUnread, columnId, multiColumn } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, columnWidth } = this.props;
     const pinned = !!columnId;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='envelope'
           active={hasUnread}
@@ -84,6 +108,8 @@ class DirectTimeline extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         />
 
         <ConversationsListContainer
diff --git a/app/javascript/mastodon/features/directory/index.js b/app/javascript/mastodon/features/directory/index.js
index 88f20d330..fa43acc24 100644
--- a/app/javascript/mastodon/features/directory/index.js
+++ b/app/javascript/mastodon/features/directory/index.js
@@ -13,6 +13,8 @@ import RadioButton from 'mastodon/components/radio_button';
 import classNames from 'classnames';
 import LoadMore from 'mastodon/components/load_more';
 import ScrollContainer from 'mastodon/containers/scroll_container';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.directory', defaultMessage: 'Browse profiles' },
@@ -26,6 +28,7 @@ const mapStateToProps = state => ({
   accountIds: state.getIn(['user_lists', 'directory', 'items'], ImmutableList()),
   isLoading: state.getIn(['user_lists', 'directory', 'isLoading'], true),
   domain: state.getIn(['meta', 'domain']),
+  columnWidth: state.getIn(['settings', 'directory', 'columnWidth'], defaultColumnWidth),
 });
 
 export default @connect(mapStateToProps)
@@ -43,6 +46,7 @@ class Directory extends React.PureComponent {
     columnId: PropTypes.string,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     domain: PropTypes.string.isRequired,
     params: PropTypes.shape({
       order: PropTypes.string,
@@ -123,8 +127,12 @@ class Directory extends React.PureComponent {
     dispatch(expandDirectory(this.getParams(this.props, this.state)));
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['directory', 'columnWidth'], value));
+  }
+
   render () {
-    const { isLoading, accountIds, intl, columnId, multiColumn, domain } = this.props;
+    const { isLoading, accountIds, intl, columnId, multiColumn, domain, columnWidth } = this.props;
     const { order, local }  = this.getParams(this.props, this.state);
     const pinned = !!columnId;
 
@@ -151,7 +159,7 @@ class Directory extends React.PureComponent {
     );
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='address-book-o'
           title={intl.formatMessage(messages.title)}
@@ -160,6 +168,8 @@ class Directory extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         />
 
         {multiColumn && !pinned ? <ScrollContainer scrollKey='directory'>{scrollableArea}</ScrollContainer> : scrollableArea}
diff --git a/app/javascript/mastodon/features/domain_blocks/index.js b/app/javascript/mastodon/features/domain_blocks/index.js
index edb80aef4..d1d5a928c 100644
--- a/app/javascript/mastodon/features/domain_blocks/index.js
+++ b/app/javascript/mastodon/features/domain_blocks/index.js
@@ -11,6 +11,7 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import DomainContainer from '../../containers/domain_container';
 import { fetchDomainBlocks, expandDomainBlocks } from '../../actions/domain_blocks';
 import ScrollableList from '../../components/scrollable_list';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.domain_blocks', defaultMessage: 'Blocked domains' },
@@ -20,6 +21,7 @@ const messages = defineMessages({
 const mapStateToProps = state => ({
   domains: state.getIn(['domain_lists', 'blocks', 'items']),
   hasMore: !!state.getIn(['domain_lists', 'blocks', 'next']),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -33,6 +35,7 @@ class Blocks extends ImmutablePureComponent {
     domains: ImmutablePropTypes.orderedSet,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -44,7 +47,7 @@ class Blocks extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, domains, hasMore, multiColumn } = this.props;
+    const { intl, domains, hasMore, multiColumn, columnWidth } = this.props;
 
     if (!domains) {
       return (
@@ -57,7 +60,7 @@ class Blocks extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.domain_blocks' defaultMessage='There are no blocked domains yet.' />;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='minus-circle' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='minus-circle' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <ScrollableList
           scrollKey='domain_blocks'
diff --git a/app/javascript/mastodon/features/domain_timeline/index.js b/app/javascript/mastodon/features/domain_timeline/index.js
index 5903f5d9b..194ac8b9b 100644
--- a/app/javascript/mastodon/features/domain_timeline/index.js
+++ b/app/javascript/mastodon/features/domain_timeline/index.js
@@ -9,11 +9,15 @@ import { expandDomainTimeline } from '../../actions/timelines';
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import ColumnSettingsContainer from './containers/column_settings_container';
 import { connectDomainStream } from '../../actions/streaming';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const mapStateToProps = (state, props) => {
   const uuid = props.columnId;
   const columns = state.getIn(['settings', 'columns']);
   const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (props.columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'domain', 'columnWidth']);
   const onlyMedia = (props.columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'onlyMedia']) : state.getIn(['settings', 'domain', 'other', 'onlyMedia']);
   const withoutMedia = (props.columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'withoutMedia']) : state.getIn(['settings', 'domain', 'other', 'withoutMedia']);
   const withoutBot = (props.columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'withoutBot']) : state.getIn(['settings', 'domain', 'other', 'withoutBot']);
@@ -26,6 +30,7 @@ const mapStateToProps = (state, props) => {
     withoutMedia,
     withoutBot,
     domain: domain,
+    columnWidth: columnWidth ?? defaultColumnWidth,
   };
 };
 
@@ -50,6 +55,7 @@ class DomainTimeline extends React.PureComponent {
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     onlyMedia: PropTypes.bool,
     withoutMedia: PropTypes.bool,
     withoutBot: PropTypes.bool,
@@ -109,12 +115,22 @@ class DomainTimeline extends React.PureComponent {
     dispatch(expandDomainTimeline(domain, { maxId, onlyMedia, withoutMedia, withoutBot }));
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['domain', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { hasUnread, columnId, multiColumn, onlyMedia, withoutMedia, withoutBot, domain } = this.props;
+    const { hasUnread, columnId, multiColumn, onlyMedia, withoutMedia, withoutBot, domain, columnWidth } = this.props;
     const pinned = !!columnId;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={domain}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={domain} columnWidth={columnWidth}>
         <ColumnHeader
           icon='users'
           active={hasUnread}
@@ -125,6 +141,8 @@ class DomainTimeline extends React.PureComponent {
           pinned={pinned}
           multiColumn={multiColumn}
           showBackButton
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer columnId={columnId} />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/emoji_reactioned_statuses/index.js b/app/javascript/mastodon/features/emoji_reactioned_statuses/index.js
index 98baf7e15..d25c78aa8 100644
--- a/app/javascript/mastodon/features/emoji_reactioned_statuses/index.js
+++ b/app/javascript/mastodon/features/emoji_reactioned_statuses/index.js
@@ -10,16 +10,27 @@ import StatusList from '../../components/status_list';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   heading: { id: 'column.emoji_reactions', defaultMessage: 'EmojiReactions' },
 });
 
-const mapStateToProps = state => ({
-  statusIds: state.getIn(['status_lists', 'emoji_reactions', 'items']),
-  isLoading: state.getIn(['status_lists', 'emoji_reactions', 'isLoading'], true),
-  hasMore: !!state.getIn(['status_lists', 'emoji_reactions', 'next']),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'emoji_reactioned_statuses', 'columnWidth']);
+
+  return {
+    statusIds: state.getIn(['status_lists', 'emoji_reactions', 'items']),
+    isLoading: state.getIn(['status_lists', 'emoji_reactions', 'isLoading'], true),
+    hasMore: !!state.getIn(['status_lists', 'emoji_reactions', 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -31,6 +42,7 @@ class EmojiReactions extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
   };
@@ -66,14 +78,24 @@ class EmojiReactions extends ImmutablePureComponent {
     this.props.dispatch(expandEmojiReactionedStatuses());
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['emoji_reactioned_statuses', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.emoji_reactioned_statuses' defaultMessage="You don't have any reaction posts yet. When you reaction one, it will show up here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='star'
           title={intl.formatMessage(messages.heading)}
@@ -82,6 +104,8 @@ class EmojiReactions extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           showBackButton
         />
 
diff --git a/app/javascript/mastodon/features/emoji_reactions/index.js b/app/javascript/mastodon/features/emoji_reactions/index.js
index 9e2fbee07..d57132f7e 100644
--- a/app/javascript/mastodon/features/emoji_reactions/index.js
+++ b/app/javascript/mastodon/features/emoji_reactions/index.js
@@ -16,6 +16,9 @@ import { createSelector } from 'reselect';
 import { Map as ImmutableMap } from 'immutable';
 import ReactedHeaderContaier from '../reactioned/containers/header_container';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   refresh: { id: 'refresh', defaultMessage: 'Refresh' },
@@ -23,12 +26,20 @@ const messages = defineMessages({
 
 const customEmojiMap = createSelector([state => state.get('custom_emojis')], items => items.reduce((map, emoji) => map.set(emoji.get('shortcode'), emoji), ImmutableMap()));
 
-const mapStateToProps = (state, props) => ({
-  emojiReactions: state.getIn(['user_lists', 'emoji_reactioned_by', props.params.statusId, 'items']),
-  isLoading: state.getIn(['user_lists', 'emoji_reactioned_by', props.params.statusId, 'isLoading'], true),
-  hasMore: !!state.getIn(['user_lists', 'emoji_reactioned_by', props.params.statusId, 'next']),
-  emojiMap: customEmojiMap(state),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'emoji_reactions', 'columnWidth']);
+
+  return {
+    emojiReactions: state.getIn(['user_lists', 'emoji_reactioned_by', params.statusId, 'items']),
+    isLoading: state.getIn(['user_lists', 'emoji_reactioned_by', params.statusId, 'isLoading'], true),
+    hasMore: !!state.getIn(['user_lists', 'emoji_reactioned_by', params.statusId, 'next']),
+    emojiMap: customEmojiMap(state),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 class Reaction extends ImmutablePureComponent {
 
@@ -65,6 +76,7 @@ class EmojiReactions extends ImmutablePureComponent {
     dispatch: PropTypes.func.isRequired,
     emojiReactions: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     emojiMap: ImmutablePropTypes.map.isRequired,
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool,
@@ -91,8 +103,18 @@ class EmojiReactions extends ImmutablePureComponent {
     this.props.dispatch(expandEmojiReactions(this.props.params.statusId));
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['emoji_reactions', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, emojiReactions, multiColumn, emojiMap, hasMore, isLoading } = this.props;
+    const { intl, emojiReactions, multiColumn, emojiMap, hasMore, isLoading, columnWidth } = this.props;
 
     if (!emojiReactions) {
       return (
@@ -105,10 +127,12 @@ class EmojiReactions extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.emoji_reactions' defaultMessage='No one has reactioned this post yet. When someone does, they will show up here.' />;
 
     return (
-      <Column bindToDocument={!multiColumn}>
+      <Column bindToDocument={!multiColumn} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
           )}
diff --git a/app/javascript/mastodon/features/favourited_statuses/index.js b/app/javascript/mastodon/features/favourited_statuses/index.js
index 73631946a..a638074ea 100644
--- a/app/javascript/mastodon/features/favourited_statuses/index.js
+++ b/app/javascript/mastodon/features/favourited_statuses/index.js
@@ -10,16 +10,27 @@ import StatusList from '../../components/status_list';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   heading: { id: 'column.favourites', defaultMessage: 'Favourites' },
 });
 
-const mapStateToProps = state => ({
-  statusIds: state.getIn(['status_lists', 'favourites', 'items']),
-  isLoading: state.getIn(['status_lists', 'favourites', 'isLoading'], true),
-  hasMore: !!state.getIn(['status_lists', 'favourites', 'next']),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'favourited_statuses', 'columnWidth']);
+
+  return {
+    statusIds: state.getIn(['status_lists', 'favourites', 'items']),
+    isLoading: state.getIn(['status_lists', 'favourites', 'isLoading'], true),
+    hasMore: !!state.getIn(['status_lists', 'favourites', 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -31,6 +42,7 @@ class Favourites extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
   };
@@ -66,14 +78,24 @@ class Favourites extends ImmutablePureComponent {
     this.props.dispatch(expandFavouritedStatuses());
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['favourited_statuses', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, columnId, multiColumn, hasMore, isLoading, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.favourited_statuses' defaultMessage="You don't have any favourite posts yet. When you favourite one, it will show up here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='star'
           title={intl.formatMessage(messages.heading)}
@@ -82,6 +104,8 @@ class Favourites extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           showBackButton
         />
 
diff --git a/app/javascript/mastodon/features/favourites/index.js b/app/javascript/mastodon/features/favourites/index.js
index 45a35f5d8..976790269 100644
--- a/app/javascript/mastodon/features/favourites/index.js
+++ b/app/javascript/mastodon/features/favourites/index.js
@@ -13,16 +13,27 @@ import Icon from 'mastodon/components/icon';
 import ColumnHeader from '../../components/column_header';
 import ReactedHeaderContaier from '../reactioned/containers/header_container';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   refresh: { id: 'refresh', defaultMessage: 'Refresh' },
 });
 
-const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'favourited_by', props.params.statusId, 'items']),
-  isLoading: state.getIn(['user_lists', 'favourited_by', props.params.statusId, 'isLoading'], true),
-  hasMore: !!state.getIn(['user_lists', 'favourited_by', props.params.statusId, 'next']),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'favourites', 'columnWidth']);
+
+  return {
+    accountIds: state.getIn(['user_lists', 'favourited_by', params.statusId, 'items']),
+    isLoading: state.getIn(['user_lists', 'favourited_by', params.statusId, 'isLoading'], true),
+    hasMore: !!state.getIn(['user_lists', 'favourited_by', params.statusId, 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -33,6 +44,7 @@ class Favourites extends ImmutablePureComponent {
     dispatch: PropTypes.func.isRequired,
     accountIds: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -58,8 +70,18 @@ class Favourites extends ImmutablePureComponent {
     this.props.dispatch(expandFavourites(this.props.params.statusId));
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['favourites', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, accountIds, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, accountIds, multiColumn, hasMore, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -72,10 +94,12 @@ class Favourites extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.favourites' defaultMessage='No one has favourited this post yet. When someone does, they will show up here.' />;
 
     return (
-      <Column bindToDocument={!multiColumn}>
+      <Column bindToDocument={!multiColumn} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
           )}
diff --git a/app/javascript/mastodon/features/follow_requests/index.js b/app/javascript/mastodon/features/follow_requests/index.js
index 1f9b635bb..1e63c5216 100644
--- a/app/javascript/mastodon/features/follow_requests/index.js
+++ b/app/javascript/mastodon/features/follow_requests/index.js
@@ -11,7 +11,7 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import AccountAuthorizeContainer from './containers/account_authorize_container';
 import { fetchFollowRequests, expandFollowRequests } from '../../actions/accounts';
 import ScrollableList from '../../components/scrollable_list';
-import { me } from '../../initial_state';
+import { me, defaultColumnWidth } from '../../initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.follow_requests', defaultMessage: 'Follow requests' },
@@ -23,6 +23,7 @@ const mapStateToProps = state => ({
   hasMore: !!state.getIn(['user_lists', 'follow_requests', 'next']),
   locked: !!state.getIn(['accounts', me, 'locked']),
   domain: state.getIn(['meta', 'domain']),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -39,6 +40,7 @@ class FollowRequests extends ImmutablePureComponent {
     domain: PropTypes.string,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -50,7 +52,7 @@ class FollowRequests extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, accountIds, hasMore, multiColumn, locked, domain, isLoading } = this.props;
+    const { intl, accountIds, hasMore, multiColumn, locked, domain, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -72,7 +74,7 @@ class FollowRequests extends ImmutablePureComponent {
     );
 
     return (
-      <Column bindToDocument={!multiColumn} icon='user-plus' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='user-plus' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <ScrollableList
           scrollKey='follow_requests'
diff --git a/app/javascript/mastodon/features/followers/index.js b/app/javascript/mastodon/features/followers/index.js
index d8ed1bd4d..589425fc5 100644
--- a/app/javascript/mastodon/features/followers/index.js
+++ b/app/javascript/mastodon/features/followers/index.js
@@ -19,7 +19,8 @@ import HeaderContainer from '../account_timeline/containers/header_container';
 import ScrollableList from '../../components/scrollable_list';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import TimelineHint from 'mastodon/components/timeline_hint';
-import { new_features_policy } from 'mastodon/initial_state';
+import { new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.account', defaultMessage: 'Account' },
@@ -34,6 +35,7 @@ const mapStateToProps = (state, props) => ({
   isLoading: state.getIn(['user_lists', 'followers', props.params.accountId, 'isLoading'], true),
   blockedBy: state.getIn(['relationships', props.params.accountId, 'blocked_by'], false),
   advancedMode: state.getIn(['settings', 'account', 'other', 'advancedMode'], new_features_policy === 'conservative' ? false : true),
+  columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
 });
 
 const RemoteHint = ({ url }) => (
@@ -60,6 +62,7 @@ class Followers extends ImmutablePureComponent {
     remote: PropTypes.bool,
     remoteUrl: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -84,12 +87,16 @@ class Followers extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl, intl } = this.props;
+    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl, columnWidth, intl } = this.props;
 
     if (!isAccount) {
       return (
@@ -120,7 +127,7 @@ class Followers extends ImmutablePureComponent {
     const remoteMessage = remote ? <RemoteHint url={remoteUrl} /> : null;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -128,6 +135,8 @@ class Followers extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/following/index.js b/app/javascript/mastodon/features/following/index.js
index 2573365b5..022e56639 100644
--- a/app/javascript/mastodon/features/following/index.js
+++ b/app/javascript/mastodon/features/following/index.js
@@ -19,7 +19,8 @@ import HeaderContainer from '../account_timeline/containers/header_container';
 import ScrollableList from '../../components/scrollable_list';
 import MissingIndicator from 'mastodon/components/missing_indicator';
 import TimelineHint from 'mastodon/components/timeline_hint';
-import { new_features_policy } from 'mastodon/initial_state';
+import { new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.account', defaultMessage: 'Account' },
@@ -34,6 +35,7 @@ const mapStateToProps = (state, props) => ({
   isLoading: state.getIn(['user_lists', 'following', props.params.accountId, 'isLoading'], true),
   blockedBy: state.getIn(['relationships', props.params.accountId, 'blocked_by'], false),
   advancedMode: state.getIn(['settings', 'account', 'other', 'advancedMode'], new_features_policy === 'conservative' ? false : true),
+  columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
 });
 
 const RemoteHint = ({ url }) => (
@@ -60,6 +62,7 @@ class Following extends ImmutablePureComponent {
     remote: PropTypes.bool,
     remoteUrl: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -84,12 +87,16 @@ class Following extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl, intl } = this.props;
+    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, remote, remoteUrl, columnWidth, intl } = this.props;
 
     if (!isAccount) {
       return (
@@ -120,7 +127,7 @@ class Following extends ImmutablePureComponent {
     const remoteMessage = remote ? <RemoteHint url={remoteUrl} /> : null;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -128,6 +135,8 @@ class Following extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/getting_started/index.js b/app/javascript/mastodon/features/getting_started/index.js
index a3afbe24c..1b26b1402 100644
--- a/app/javascript/mastodon/features/getting_started/index.js
+++ b/app/javascript/mastodon/features/getting_started/index.js
@@ -7,7 +7,7 @@ import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
-import { me, profile_directory, showTrends, enable_limited_timeline, enableEmptyColumn } from '../../initial_state';
+import { me, profile_directory, showTrends, enable_limited_timeline, enableEmptyColumn, defaultColumnWidth } from '../../initial_state';
 import { fetchFollowRequests } from 'mastodon/actions/accounts';
 import { fetchFavouriteDomains } from 'mastodon/actions/favourite_domains';
 import { fetchFavouriteTags } from 'mastodon/actions/favourite_tags';
@@ -61,6 +61,7 @@ const mapStateToProps = state => ({
   lists: getOrderedLists(state),
   favourite_domains: getOrderedDomains(state),
   favourite_tags: getOrderedTags(state),
+  columnWidth: defaultColumnWidth,
 });
 
 const mapDispatchToProps = dispatch => ({
@@ -94,6 +95,7 @@ class GettingStarted extends ImmutablePureComponent {
     myAccount: ImmutablePropTypes.map.isRequired,
     columns: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     fetchFollowRequests: PropTypes.func.isRequired,
     fetchFavouriteDomains: PropTypes.func.isRequired,
     fetchFavouriteTags: PropTypes.func.isRequired,
@@ -118,7 +120,7 @@ class GettingStarted extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, myAccount, columns, multiColumn, unreadFollowRequests, lists, favourite_domains, favourite_tags } = this.props;
+    const { intl, myAccount, columns, multiColumn, unreadFollowRequests, lists, favourite_domains, favourite_tags, columnWidth } = this.props;
   
     const navItems = [];
     let height = (multiColumn) ? 0 : 60;
@@ -264,7 +266,7 @@ class GettingStarted extends ImmutablePureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.menu)}>
+      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.menu)} columnWidth={columnWidth}>
         {multiColumn && <div className='column-header__wrapper'>
           <h1 className='column-header'>
             <button>
diff --git a/app/javascript/mastodon/features/group_directory/index.js b/app/javascript/mastodon/features/group_directory/index.js
index a32c0d6d6..b3bb1848b 100644
--- a/app/javascript/mastodon/features/group_directory/index.js
+++ b/app/javascript/mastodon/features/group_directory/index.js
@@ -13,6 +13,8 @@ import RadioButton from 'mastodon/components/radio_button';
 import classNames from 'classnames';
 import LoadMore from 'mastodon/components/load_more';
 import { ScrollContainer } from 'react-router-scroll-4';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.group_directory', defaultMessage: 'Browse groups' },
@@ -23,6 +25,7 @@ const messages = defineMessages({
 const mapStateToProps = state => ({
   accountIds: state.getIn(['user_lists', 'group_directory', 'items'], ImmutableList()),
   isLoading: state.getIn(['user_lists', 'group_directory', 'isLoading'], true),
+  columnWidth: state.getIn(['settings', 'group_directory', 'columnWidth'], defaultColumnWidth),
 });
 
 export default @connect(mapStateToProps)
@@ -40,6 +43,7 @@ class GroupDirectory extends React.PureComponent {
     columnId: PropTypes.string,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     params: PropTypes.shape({
       order: PropTypes.string,
     }),
@@ -107,8 +111,12 @@ class GroupDirectory extends React.PureComponent {
     dispatch(expandGroupDirectory(this.getParams(this.props, this.state)));
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['group_directory', 'columnWidth'], value));
+  }
+
   render () {
-    const { isLoading, accountIds, intl, columnId, multiColumn } = this.props;
+    const { isLoading, accountIds, intl, columnId, multiColumn, columnWidth } = this.props;
     const { order }  = this.getParams(this.props, this.state);
     const pinned = !!columnId;
 
@@ -130,7 +138,7 @@ class GroupDirectory extends React.PureComponent {
     );
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='address-book-o'
           title={intl.formatMessage(messages.title)}
@@ -139,6 +147,8 @@ class GroupDirectory extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         />
 
         {multiColumn && !pinned ? <ScrollContainer scrollKey='group_directory'>{scrollableArea}</ScrollContainer> : scrollableArea}
diff --git a/app/javascript/mastodon/features/group_timeline/index.js b/app/javascript/mastodon/features/group_timeline/index.js
index 326faa0fa..c18034ffb 100644
--- a/app/javascript/mastodon/features/group_timeline/index.js
+++ b/app/javascript/mastodon/features/group_timeline/index.js
@@ -15,6 +15,9 @@ import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import ColumnSettingsContainer from './containers/column_settings_container';
 import GroupDetail from './components/group_detail';
 import { connectGroupStream } from '../../actions/streaming';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.group', defaultMessage: 'Group timeline' },
@@ -32,6 +35,7 @@ const makeMapStateToProps = () => {
     const onlyMedia = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'onlyMedia']) : state.getIn(['settings', 'group', 'other', 'onlyMedia']);
     const withoutMedia = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'withoutMedia']) : state.getIn(['settings', 'group', 'other', 'withoutMedia']);
     const timelineState = state.getIn(['timelines', `group:${id}${withoutMedia ? ':nomedia' : ''}${onlyMedia ? ':media' : ''}${tagged ? `:${tagged}` : ''}`]);
+    const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'group', 'columnWidth']);
     const account = getAccount(state, id);
 
     return {
@@ -39,6 +43,7 @@ const makeMapStateToProps = () => {
       onlyMedia,
       withoutMedia,
       account,
+      columnWidth: columnWidth ?? defaultColumnWidth,
     };
   };
 
@@ -66,6 +71,7 @@ class GroupTimeline extends React.PureComponent {
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     onlyMedia: PropTypes.bool,
     withoutMedia: PropTypes.bool,
   };
@@ -138,8 +144,18 @@ class GroupTimeline extends React.PureComponent {
     this.setState({ animating: false });
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['group', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, hasUnread, columnId, multiColumn, onlyMedia, withoutMedia, params: { id, tagged }, account } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, onlyMedia, withoutMedia, params: { id, tagged }, account, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const { collapsed, animating } = this.state;
@@ -179,7 +195,7 @@ class GroupTimeline extends React.PureComponent {
     );
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={title}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={title} columnWidth={columnWidth}>
         <ColumnHeader
           icon='users'
           active={hasUnread}
@@ -190,6 +206,8 @@ class GroupTimeline extends React.PureComponent {
           pinned={pinned}
           multiColumn={multiColumn}
           extraButton={groupDetailButton}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer columnId={columnId} />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/hashtag_timeline/index.js b/app/javascript/mastodon/features/hashtag_timeline/index.js
index f03b8e7a2..66b6224b5 100644
--- a/app/javascript/mastodon/features/hashtag_timeline/index.js
+++ b/app/javascript/mastodon/features/hashtag_timeline/index.js
@@ -14,16 +14,27 @@ import { isEqual } from 'lodash';
 import { fetchHashtag, followHashtag, unfollowHashtag } from 'mastodon/actions/tags';
 import Icon from 'mastodon/components/icon';
 import classNames from 'classnames';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   followHashtag: { id: 'hashtag.follow', defaultMessage: 'Follow hashtag' },
   unfollowHashtag: { id: 'hashtag.unfollow', defaultMessage: 'Unfollow hashtag' },
 });
 
-const mapStateToProps = (state, props) => ({
-  hasUnread: state.getIn(['timelines', `hashtag:${props.params.id}`, 'unread']) > 0,
-  tag: state.getIn(['tags', props.params.id]),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'hashtag', 'columnWidth']);
+
+  return {
+    hasUnread: state.getIn(['timelines', `hashtag:${params.id}`, 'unread']) > 0,
+    tag: state.getIn(['tags', params.id]),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -38,6 +49,7 @@ class HashtagTimeline extends React.PureComponent {
     hasUnread: PropTypes.bool,
     tag: ImmutablePropTypes.map,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     intl: PropTypes.object,
   };
 
@@ -166,8 +178,18 @@ class HashtagTimeline extends React.PureComponent {
     }
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['hashtag', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { hasUnread, columnId, multiColumn, tag, intl } = this.props;
+    const { hasUnread, columnId, multiColumn, tag, columnWidth, intl } = this.props;
     const { id } = this.props.params;
     const pinned = !!columnId;
 
@@ -184,7 +206,7 @@ class HashtagTimeline extends React.PureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={`#${id}`}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={`#${id}`} columnWidth={columnWidth}>
         <ColumnHeader
           icon='hashtag'
           active={hasUnread}
@@ -196,6 +218,8 @@ class HashtagTimeline extends React.PureComponent {
           multiColumn={multiColumn}
           extraButton={followButton}
           showBackButton
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           {columnId && <ColumnSettingsContainer columnId={columnId} />}
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/home_timeline/index.js b/app/javascript/mastodon/features/home_timeline/index.js
index a3fea194b..6dd255f63 100644
--- a/app/javascript/mastodon/features/home_timeline/index.js
+++ b/app/javascript/mastodon/features/home_timeline/index.js
@@ -14,6 +14,9 @@ import { fetchAnnouncements, toggleShowAnnouncements } from 'mastodon/actions/an
 import AnnouncementsContainer from 'mastodon/features/getting_started/containers/announcements_container';
 import classNames from 'classnames';
 import IconWithBadge from 'mastodon/components/icon_with_badge';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.home', defaultMessage: 'Home' },
@@ -21,14 +24,22 @@ const messages = defineMessages({
   hide_announcements: { id: 'home.hide_announcements', defaultMessage: 'Hide announcements' },
 });
 
-const mapStateToProps = state => ({
-  hasUnread: state.getIn(['timelines', 'home', 'unread']) > 0,
-  isPartial: state.getIn(['timelines', 'home', 'isPartial']),
-  hasAnnouncements: !state.getIn(['announcements', 'items']).isEmpty(),
-  unreadAnnouncements: state.getIn(['announcements', 'items']).count(item => !item.get('read')),
-  showAnnouncements: state.getIn(['announcements', 'show']),
-  visibilities: getHomeVisibilities(state),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'home', 'columnWidth']);
+
+  return {
+    hasUnread: state.getIn(['timelines', 'home', 'unread']) > 0,
+    isPartial: state.getIn(['timelines', 'home', 'isPartial']),
+    hasAnnouncements: !state.getIn(['announcements', 'items']).isEmpty(),
+    unreadAnnouncements: state.getIn(['announcements', 'items']).count(item => !item.get('read')),
+    showAnnouncements: state.getIn(['announcements', 'show']),
+    visibilities: getHomeVisibilities(state),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -41,6 +52,7 @@ class HomeTimeline extends React.PureComponent {
     isPartial: PropTypes.bool,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasAnnouncements: PropTypes.bool,
     unreadAnnouncements: PropTypes.number,
     showAnnouncements: PropTypes.bool,
@@ -121,8 +133,18 @@ class HomeTimeline extends React.PureComponent {
     this.props.dispatch(toggleShowAnnouncements());
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['home', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, hasUnread, columnId, multiColumn, hasAnnouncements, unreadAnnouncements, showAnnouncements } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, hasAnnouncements, unreadAnnouncements, showAnnouncements, columnWidth } = this.props;
     const pinned = !!columnId;
 
     let announcementsButton = null;
@@ -142,7 +164,7 @@ class HomeTimeline extends React.PureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='home'
           active={hasUnread}
@@ -154,6 +176,8 @@ class HomeTimeline extends React.PureComponent {
           multiColumn={multiColumn}
           extraButton={announcementsButton}
           appendContent={hasAnnouncements && showAnnouncements && <AnnouncementsContainer />}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/keyboard_shortcuts/index.js b/app/javascript/mastodon/features/keyboard_shortcuts/index.js
index deb0fd92e..e66423b37 100644
--- a/app/javascript/mastodon/features/keyboard_shortcuts/index.js
+++ b/app/javascript/mastodon/features/keyboard_shortcuts/index.js
@@ -4,24 +4,31 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'keyboard_shortcuts.heading', defaultMessage: 'Keyboard Shortcuts' },
 });
 
-export default @injectIntl
+const mapStateToProps = state => ({
+  columnWidth: defaultColumnWidth,
+});
+
+export default @connect(mapStateToProps)
+@injectIntl
 class KeyboardShortcuts extends ImmutablePureComponent {
 
   static propTypes = {
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   render () {
-    const { intl, multiColumn } = this.props;
+    const { intl, multiColumn, columnWidth } = this.props;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='question' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='question' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <div className='keyboard-shortcuts scrollable optionally-scrollable'>
           <table>
diff --git a/app/javascript/mastodon/features/limited_timeline/index.js b/app/javascript/mastodon/features/limited_timeline/index.js
index 9ba828936..dec75b063 100644
--- a/app/javascript/mastodon/features/limited_timeline/index.js
+++ b/app/javascript/mastodon/features/limited_timeline/index.js
@@ -9,15 +9,26 @@ import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import { getLimitedVisibilities } from 'mastodon/selectors';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ColumnSettingsContainer from './containers/column_settings_container';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.limited', defaultMessage: 'Limited' },
 });
 
-const mapStateToProps = state => ({
-  hasUnread: state.getIn(['timelines', 'limited', 'unread']) > 0,
-  visibilities: getLimitedVisibilities(state),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'limited', 'columnWidth']);
+
+  return {
+    hasUnread: state.getIn(['timelines', 'limited', 'unread']) > 0,
+    visibilities: getLimitedVisibilities(state),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -30,6 +41,7 @@ class LimitedTimeline extends React.PureComponent {
     visibilities: PropTypes.arrayOf(PropTypes.string),
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   handlePin = () => {
@@ -75,12 +87,22 @@ class LimitedTimeline extends React.PureComponent {
     }
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['limited', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, hasUnread, columnId, multiColumn } = this.props;
+    const { intl, hasUnread, columnId, multiColumn, columnWidth } = this.props;
     const pinned = !!columnId;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='lock'
           active={hasUnread}
@@ -90,6 +112,8 @@ class LimitedTimeline extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/list_timeline/index.js b/app/javascript/mastodon/features/list_timeline/index.js
index 8010274f8..920d7d3aa 100644
--- a/app/javascript/mastodon/features/list_timeline/index.js
+++ b/app/javascript/mastodon/features/list_timeline/index.js
@@ -16,6 +16,9 @@ import MissingIndicator from '../../components/missing_indicator';
 import LoadingIndicator from '../../components/loading_indicator';
 import Icon from 'mastodon/components/icon';
 import RadioButton from 'mastodon/components/radio_button';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   deleteMessage: { id: 'confirmations.delete_list.message', defaultMessage: 'Are you sure you want to permanently delete this list?' },
@@ -25,10 +28,18 @@ const messages = defineMessages({
   list:  { id: 'lists.replies_policy.list', defaultMessage: 'Members of the list' },
 });
 
-const mapStateToProps = (state, props) => ({
-  list: state.getIn(['lists', props.params.id]),
-  hasUnread: state.getIn(['timelines', `list:${props.params.id}`, 'unread']) > 0,
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'list', 'columnWidth']);
+
+  return {
+    list: state.getIn(['lists', params.id]),
+    hasUnread: state.getIn(['timelines', `list:${params.id}`, 'unread']) > 0,
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -44,6 +55,7 @@ class ListTimeline extends React.PureComponent {
     columnId: PropTypes.string,
     hasUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     list: PropTypes.oneOfType([ImmutablePropTypes.map, PropTypes.bool]),
     intl: PropTypes.object.isRequired,
   };
@@ -140,8 +152,18 @@ class ListTimeline extends React.PureComponent {
     dispatch(updateList(id, undefined, false, target.value));
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['list', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { hasUnread, columnId, multiColumn, list, intl } = this.props;
+    const { hasUnread, columnId, multiColumn, list, columnWidth, intl } = this.props;
     const { id } = this.props.params;
     const pinned = !!columnId;
     const title  = list ? list.get('title') : id;
@@ -165,7 +187,7 @@ class ListTimeline extends React.PureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={title}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={title} columnWidth={columnWidth}>
         <ColumnHeader
           icon='list-ul'
           active={hasUnread}
@@ -175,6 +197,8 @@ class ListTimeline extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <div className='column-settings__row column-header__links'>
             <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleEditClick}>
diff --git a/app/javascript/mastodon/features/lists/index.js b/app/javascript/mastodon/features/lists/index.js
index 06cb08280..35e42b52e 100644
--- a/app/javascript/mastodon/features/lists/index.js
+++ b/app/javascript/mastodon/features/lists/index.js
@@ -13,6 +13,7 @@ import NewListForm from './components/new_list_form';
 import List from './components/list';
 import { createSelector } from 'reselect';
 import ScrollableList from '../../components/scrollable_list';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.lists', defaultMessage: 'Lists' },
@@ -29,6 +30,7 @@ const getOrderedLists = createSelector([state => state.get('lists')], lists => {
 
 const mapStateToProps = state => ({
   lists: getOrderedLists(state),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -41,6 +43,7 @@ class Lists extends ImmutablePureComponent {
     lists: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -48,7 +51,7 @@ class Lists extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, lists, multiColumn } = this.props;
+    const { intl, lists, multiColumn, columnWidth } = this.props;
 
     if (!lists) {
       return (
@@ -61,7 +64,7 @@ class Lists extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.lists' defaultMessage="You don't have any lists yet. When you create one, it will show up here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='list-ul' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='list-ul' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
 
         <NewListForm />
diff --git a/app/javascript/mastodon/features/mentions/index.js b/app/javascript/mastodon/features/mentions/index.js
index 7aff6a8d9..0b257038f 100644
--- a/app/javascript/mastodon/features/mentions/index.js
+++ b/app/javascript/mastodon/features/mentions/index.js
@@ -11,12 +11,23 @@ import Column from '../ui/components/column';
 import ScrollableList from '../../components/scrollable_list';
 import ColumnHeader from '../../components/column_header';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
-const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'mentioned_by', props.params.statusId, 'items']),
-  isLoading: state.getIn(['user_lists', 'mentioned_by', props.params.statusId, 'isLoading'], true),
-  hasMore: !!state.getIn(['user_lists', 'mentioned_by', props.params.statusId, 'next']),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'mentions', 'columnWidth']);
+
+  return {
+    accountIds: state.getIn(['user_lists', 'mentioned_by', params.statusId, 'items']),
+    isLoading: state.getIn(['user_lists', 'mentioned_by', params.statusId, 'isLoading'], true),
+    hasMore: !!state.getIn(['user_lists', 'mentioned_by', params.statusId, 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -27,6 +38,7 @@ class Mentions extends ImmutablePureComponent {
     dispatch: PropTypes.func.isRequired,
     accountIds: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -48,8 +60,18 @@ class Mentions extends ImmutablePureComponent {
     this.props.dispatch(expandMentions(this.props.params.statusId));
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['mentions', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { accountIds, multiColumn, hasMore, isLoading } = this.props;
+    const { accountIds, multiColumn, hasMore, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -62,10 +84,12 @@ class Mentions extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.mentions' defaultMessage='No one has mentioned this toot.' />;
 
     return (
-      <Column bindToDocument={!multiColumn}>
+      <Column bindToDocument={!multiColumn} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         />
 
         <ScrollableList
diff --git a/app/javascript/mastodon/features/mutes/index.js b/app/javascript/mastodon/features/mutes/index.js
index c1d50d194..9e76c5a55 100644
--- a/app/javascript/mastodon/features/mutes/index.js
+++ b/app/javascript/mastodon/features/mutes/index.js
@@ -11,6 +11,7 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import AccountContainer from '../../containers/account_container';
 import { fetchMutes, expandMutes } from '../../actions/mutes';
 import ScrollableList from '../../components/scrollable_list';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.mutes', defaultMessage: 'Muted users' },
@@ -20,6 +21,7 @@ const mapStateToProps = state => ({
   accountIds: state.getIn(['user_lists', 'mutes', 'items']),
   hasMore: !!state.getIn(['user_lists', 'mutes', 'next']),
   isLoading: state.getIn(['user_lists', 'mutes', 'isLoading'], true),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -34,6 +36,7 @@ class Mutes extends ImmutablePureComponent {
     accountIds: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -45,7 +48,7 @@ class Mutes extends ImmutablePureComponent {
   }, 300, { leading: true });
 
   render () {
-    const { intl, hasMore, accountIds, multiColumn, isLoading } = this.props;
+    const { intl, hasMore, accountIds, multiColumn, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -58,7 +61,7 @@ class Mutes extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.mutes' defaultMessage="You haven't muted any users yet." />;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='volume-off' heading={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} icon='volume-off' heading={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <ScrollableList
           scrollKey='mutes'
diff --git a/app/javascript/mastodon/features/notifications/index.js b/app/javascript/mastodon/features/notifications/index.js
index a6a277d7e..e11eada81 100644
--- a/app/javascript/mastodon/features/notifications/index.js
+++ b/app/javascript/mastodon/features/notifications/index.js
@@ -26,6 +26,9 @@ import LoadGap from '../../components/load_gap';
 import Icon from 'mastodon/components/icon';
 import compareId from 'mastodon/compare_id';
 import NotificationsPermissionBanner from './components/notifications_permission_banner';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.notifications', defaultMessage: 'Notifications' },
@@ -53,17 +56,25 @@ const getNotifications = createSelector([
   return notifications.filter(item => item === null || allowedType === item.get('type'));
 });
 
-const mapStateToProps = state => ({
-  showFilterBar: state.getIn(['settings', 'notifications', 'quickFilter', 'show']),
-  notifications: getNotifications(state),
-  isLoading: state.getIn(['notifications', 'isLoading'], true),
-  isUnread: state.getIn(['notifications', 'unread']) > 0 || state.getIn(['notifications', 'pendingItems']).size > 0,
-  hasMore: state.getIn(['notifications', 'hasMore']),
-  numPending: state.getIn(['notifications', 'pendingItems'], ImmutableList()).size,
-  lastReadId: state.getIn(['settings', 'notifications', 'showUnread']) ? state.getIn(['notifications', 'readMarkerId']) : '0',
-  canMarkAsRead: state.getIn(['settings', 'notifications', 'showUnread']) && state.getIn(['notifications', 'readMarkerId']) !== '0' && getNotifications(state).some(item => item !== null && compareId(item.get('id'), state.getIn(['notifications', 'readMarkerId'])) > 0),
-  needsNotificationPermission: state.getIn(['settings', 'notifications', 'alerts']).includes(true) && state.getIn(['notifications', 'browserSupport']) && state.getIn(['notifications', 'browserPermission']) === 'default' && !state.getIn(['settings', 'notifications', 'dismissPermissionBanner']),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'notifications', 'columnWidth']);
+
+  return {
+    showFilterBar: state.getIn(['settings', 'notifications', 'quickFilter', 'show']),
+    notifications: getNotifications(state),
+    isLoading: state.getIn(['notifications', 'isLoading'], true),
+    isUnread: state.getIn(['notifications', 'unread']) > 0 || state.getIn(['notifications', 'pendingItems']).size > 0,
+    hasMore: state.getIn(['notifications', 'hasMore']),
+    numPending: state.getIn(['notifications', 'pendingItems'], ImmutableList()).size,
+    lastReadId: state.getIn(['settings', 'notifications', 'showUnread']) ? state.getIn(['notifications', 'readMarkerId']) : '0',
+    canMarkAsRead: state.getIn(['settings', 'notifications', 'showUnread']) && state.getIn(['notifications', 'readMarkerId']) !== '0' && getNotifications(state).some(item => item !== null && compareId(item.get('id'), state.getIn(['notifications', 'readMarkerId'])) > 0),
+    needsNotificationPermission: state.getIn(['settings', 'notifications', 'alerts']).includes(true) && state.getIn(['notifications', 'browserSupport']) && state.getIn(['notifications', 'browserPermission']) === 'default' && !state.getIn(['settings', 'notifications', 'dismissPermissionBanner']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -78,6 +89,7 @@ class Notifications extends React.PureComponent {
     isLoading: PropTypes.bool,
     isUnread: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasMore: PropTypes.bool,
     numPending: PropTypes.number,
     lastReadId: PropTypes.string,
@@ -174,8 +186,18 @@ class Notifications extends React.PureComponent {
     this.props.dispatch(submitMarkers({ immediate: true }));
   };
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['notifications', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, notifications, isLoading, isUnread, columnId, multiColumn, hasMore, numPending, showFilterBar, lastReadId, canMarkAsRead, needsNotificationPermission } = this.props;
+    const { intl, notifications, isLoading, isUnread, columnId, multiColumn, hasMore, numPending, showFilterBar, lastReadId, canMarkAsRead, needsNotificationPermission, columnWidth } = this.props;
     const pinned = !!columnId;
     const emptyMessage = <FormattedMessage id='empty_column.notifications' defaultMessage="You don't have any notifications yet. When other people interact with you, you will see it here." />;
 
@@ -248,7 +270,7 @@ class Notifications extends React.PureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setColumnRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setColumnRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='bell'
           active={isUnread}
@@ -259,6 +281,8 @@ class Notifications extends React.PureComponent {
           pinned={pinned}
           multiColumn={multiColumn}
           extraButton={extraButton}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/pinned_statuses/index.js b/app/javascript/mastodon/features/pinned_statuses/index.js
index f32bd6d23..b813c631c 100644
--- a/app/javascript/mastodon/features/pinned_statuses/index.js
+++ b/app/javascript/mastodon/features/pinned_statuses/index.js
@@ -8,6 +8,7 @@ import ColumnBackButtonSlim from '../../components/column_back_button_slim';
 import StatusList from '../../components/status_list';
 import { defineMessages, injectIntl } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import { defaultColumnWidth } from 'mastodon/initial_state';
 
 const messages = defineMessages({
   heading: { id: 'column.pins', defaultMessage: 'Pinned toot' },
@@ -16,6 +17,7 @@ const messages = defineMessages({
 const mapStateToProps = state => ({
   statusIds: state.getIn(['status_lists', 'pins', 'items']),
   hasMore: !!state.getIn(['status_lists', 'pins', 'next']),
+  columnWidth: defaultColumnWidth,
 });
 
 export default @connect(mapStateToProps)
@@ -28,6 +30,7 @@ class PinnedStatuses extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -43,10 +46,10 @@ class PinnedStatuses extends ImmutablePureComponent {
   }
 
   render () {
-    const { intl, statusIds, hasMore, multiColumn } = this.props;
+    const { intl, statusIds, hasMore, multiColumn, columnWidth } = this.props;
 
     return (
-      <Column bindToDocument={!multiColumn} icon='thumb-tack' heading={intl.formatMessage(messages.heading)} ref={this.setRef}>
+      <Column bindToDocument={!multiColumn} icon='thumb-tack' heading={intl.formatMessage(messages.heading)} ref={this.setRef} columnWidth={columnWidth}>
         <ColumnBackButtonSlim />
         <StatusList
           statusIds={statusIds}
diff --git a/app/javascript/mastodon/features/public_timeline/index.js b/app/javascript/mastodon/features/public_timeline/index.js
index 26596fd4a..09d4d983a 100644
--- a/app/javascript/mastodon/features/public_timeline/index.js
+++ b/app/javascript/mastodon/features/public_timeline/index.js
@@ -9,6 +9,9 @@ import { expandPublicTimeline } from '../../actions/timelines';
 import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
 import ColumnSettingsContainer from './containers/column_settings_container';
 import { connectPublicStream } from '../../actions/streaming';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   title: { id: 'column.public', defaultMessage: 'Federated timeline' },
@@ -22,6 +25,7 @@ const mapStateToProps = (state, { columnId }) => {
   const withoutMedia = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'withoutMedia']) : state.getIn(['settings', 'public', 'other', 'withoutMedia']);
   const withoutBot = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'withoutBot']) : state.getIn(['settings', 'public', 'other', 'withoutBot']);
   const onlyRemote = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'other', 'onlyRemote']) : state.getIn(['settings', 'public', 'other', 'onlyRemote']);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'public', 'columnWidth']);
   const timelineState = state.getIn(['timelines', `public${onlyRemote ? ':remote' : ''}${withoutBot ? ':nobot' : ':bot'}${withoutMedia ? ':nomedia' : ''}${onlyMedia ? ':media' : ''}`]);
 
   return {
@@ -30,6 +34,7 @@ const mapStateToProps = (state, { columnId }) => {
     withoutMedia,
     withoutBot,
     onlyRemote,
+    columnWidth: columnWidth ?? defaultColumnWidth,
   };
 };
 
@@ -53,6 +58,7 @@ class PublicTimeline extends React.PureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasUnread: PropTypes.bool,
     onlyMedia: PropTypes.bool,
     withoutMedia: PropTypes.bool,
@@ -79,6 +85,16 @@ class PublicTimeline extends React.PureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['public', 'columnWidth'], value));
+    }
+  }
+
   componentDidMount () {
     const { dispatch, onlyMedia, withoutMedia, withoutBot, onlyRemote } = this.props;
 
@@ -114,11 +130,11 @@ class PublicTimeline extends React.PureComponent {
   }
 
   render () {
-    const { intl, columnId, hasUnread, multiColumn, onlyMedia, withoutMedia, withoutBot, onlyRemote } = this.props;
+    const { intl, columnId, hasUnread, multiColumn, onlyMedia, withoutMedia, withoutBot, onlyRemote, columnWidth } = this.props;
     const pinned = !!columnId;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='globe'
           active={hasUnread}
@@ -128,6 +144,8 @@ class PublicTimeline extends React.PureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer columnId={columnId} />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/reblogs/index.js b/app/javascript/mastodon/features/reblogs/index.js
index d942a3660..bf95d04ee 100644
--- a/app/javascript/mastodon/features/reblogs/index.js
+++ b/app/javascript/mastodon/features/reblogs/index.js
@@ -13,16 +13,27 @@ import Icon from 'mastodon/components/icon';
 import ColumnHeader from '../../components/column_header';
 import ReactedHeaderContaier from '../reactioned/containers/header_container';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   refresh: { id: 'refresh', defaultMessage: 'Refresh' },
 });
 
-const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'reblogged_by', props.params.statusId, 'items']),
-  isLoading: state.getIn(['user_lists', 'reblogged_by', props.params.statusId, 'isLoading'], true),
-  hasMore: !!state.getIn(['user_lists', 'reblogged_by', props.params.statusId, 'next']),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'reblogs', 'columnWidth']);
+
+  return {
+    accountIds: state.getIn(['user_lists', 'reblogged_by', params.statusId, 'items']),
+    isLoading: state.getIn(['user_lists', 'reblogged_by', params.statusId, 'isLoading'], true),
+    hasMore: !!state.getIn(['user_lists', 'reblogged_by', params.statusId, 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -33,6 +44,7 @@ class Reblogs extends ImmutablePureComponent {
     dispatch: PropTypes.func.isRequired,
     accountIds: ImmutablePropTypes.list,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     intl: PropTypes.object.isRequired,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
@@ -58,8 +70,18 @@ class Reblogs extends ImmutablePureComponent {
     this.props.dispatch(expandReblogs(this.props.params.statusId));
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['reblogs', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, accountIds, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, accountIds, multiColumn, hasMore, isLoading, columnWidth } = this.props;
 
     if (!accountIds) {
       return (
@@ -72,10 +94,12 @@ class Reblogs extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='status.reblogs.empty' defaultMessage='No one has boosted this toot yet. When someone does, they will show up here.' />;
 
     return (
-      <Column bindToDocument={!multiColumn}>
+      <Column bindToDocument={!multiColumn} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
           )}
diff --git a/app/javascript/mastodon/features/referred_by_statuses/index.js b/app/javascript/mastodon/features/referred_by_statuses/index.js
index c587ef953..dea550430 100644
--- a/app/javascript/mastodon/features/referred_by_statuses/index.js
+++ b/app/javascript/mastodon/features/referred_by_statuses/index.js
@@ -12,17 +12,28 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import ReactedHeaderContaier from '../reactioned/containers/header_container';
 import { debounce } from 'lodash';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   refresh: { id: 'refresh', defaultMessage: 'Refresh' },
   heading: { id: 'column.referred_by_statuses', defaultMessage: 'Referred by posts' },
 });
 
-const mapStateToProps = (state, props) => ({
-  statusIds: state.getIn(['status_status_lists', 'referred_by', props.params.statusId, 'items']),
-  isLoading: state.getIn(['status_status_lists', 'referred_by', props.params.statusId, 'isLoading'], true),
-  hasMore: !!state.getIn(['status_status_lists', 'referred_by', props.params.statusId, 'next']),
-});
+const mapStateToProps = (state, { columnId, params }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'referred_by_statuses', 'columnWidth']);
+
+  return {
+    statusIds: state.getIn(['status_status_lists', 'referred_by', params.statusId, 'items']),
+    isLoading: state.getIn(['status_status_lists', 'referred_by', params.statusId, 'isLoading'], true),
+    hasMore: !!state.getIn(['status_status_lists', 'referred_by', params.statusId, 'next']),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -33,6 +44,7 @@ class ReferredByStatuses extends ImmutablePureComponent {
     statusIds: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
   };
@@ -57,8 +69,18 @@ class ReferredByStatuses extends ImmutablePureComponent {
     this.props.dispatch(expandReferredByStatuses(this.props.params.statusId));
   }, 300, { leading: true })
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['referred_by_statuses', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, statusIds, multiColumn, hasMore, isLoading } = this.props;
+    const { intl, statusIds, multiColumn, hasMore, isLoading, columnWidth } = this.props;
 
     if (!statusIds) {
       return (
@@ -71,10 +93,12 @@ class ReferredByStatuses extends ImmutablePureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.referred_by_statuses' defaultMessage="There are no referred by posts yet. When someone refers a post, it will appear here." />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
           )}
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index 3bee1d945..70046c62d 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -65,6 +65,9 @@ import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from
 import { textForScreenReader, defaultMediaVisibility } from '../../components/status';
 import Icon from 'mastodon/components/icon';
 import DetailedHeaderContaier from './containers/header_container';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
@@ -148,8 +151,12 @@ const makeMapStateToProps = () => {
     return ImmutableList(contextReference.get(statusId));
   });
 
-  const mapStateToProps = (state, props) => {
-    const status         = getStatus(state, { id: props.params.statusId });
+  const mapStateToProps = (state, { columnId, params }) => {
+    const uuid = columnId;
+    const columns = state.getIn(['settings', 'columns']);
+    const index = columns.findIndex(c => c.get('uuid') === uuid);
+    const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'status', 'columnWidth']);
+    const status         = getStatus(state, { id: params.statusId });
     const ancestorsIds   = status ? getAncestorsIds(state, { id: status.get('in_reply_to_id') }) : ImmutableList();
     const descendantsIds = status ? getDescendantsIds(state, { id: status.get('id') }) : ImmutableList();
     const referencesIds  = status ? getReferencesIds(state, { id: status.get('id') }) : ImmutableList();
@@ -161,10 +168,11 @@ const makeMapStateToProps = () => {
       descendantsIds,
       askReplyConfirmation: state.getIn(['compose', 'text']).trim().length !== 0,
       domain: state.getIn(['meta', 'domain']),
-      pictureInPicture: getPictureInPicture(state, { id: props.params.statusId }),
+      pictureInPicture: getPictureInPicture(state, { id: params.statusId }),
       emojiMap: customEmojiMap(state),
       referenced: state.getIn(['compose', 'references']).has(id),
       contextReferenced: state.getIn(['compose', 'context_references']).has(id),
+      columnWidth: columnWidth ?? defaultColumnWidth,
     };
   };
 
@@ -190,6 +198,7 @@ class Status extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     askReplyConfirmation: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     domain: PropTypes.string.isRequired,
     pictureInPicture: ImmutablePropTypes.contains({
       inUse: PropTypes.bool,
@@ -561,9 +570,19 @@ class Status extends ImmutablePureComponent {
     this.setState({ fullscreen: isFullscreen() });
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['status', 'columnWidth'], value));
+    }
+  }
+
   render () {
     let ancestors, descendants;
-    const { status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture, emojiMap, referenced, contextReferenced } = this.props;
+    const { status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture, emojiMap, referenced, contextReferenced, columnWidth } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -599,10 +618,12 @@ class Status extends ImmutablePureComponent {
     };
 
     return (
-      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.detailedStatus)}>
+      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.detailedStatus)} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><Icon id={status.get('hidden') ? 'eye-slash' : 'eye'} /></button>
           )}
diff --git a/app/javascript/mastodon/features/status_references/index.js b/app/javascript/mastodon/features/status_references/index.js
index 75264222e..7c0835fc5 100644
--- a/app/javascript/mastodon/features/status_references/index.js
+++ b/app/javascript/mastodon/features/status_references/index.js
@@ -22,6 +22,9 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../ui/util/fullscreen';
 import Icon from 'mastodon/components/icon';
 import DetailedHeaderContaier from '../status/containers/header_container';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   revealAll: { id: 'status.show_more_all', defaultMessage: 'Show more for all' },
@@ -39,13 +42,18 @@ const makeMapStateToProps = () => {
     return ImmutableList(contextReference.get(statusId));
   });
 
-  const mapStateToProps = (state, props) => {
-    const status         = getStatus(state, { id: props.params.statusId });
+  const mapStateToProps = (state, { columnId, params }) => {
+    const uuid = columnId;
+    const columns = state.getIn(['settings', 'columns']);
+    const index = columns.findIndex(c => c.get('uuid') === uuid);
+    const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'status_references', 'columnWidth']);
+    const status         = getStatus(state, { id: params.statusId });
     const referencesIds  = status ? getReferencesIds(state, { id: status.get('id') }) : ImmutableList();
 
     return {
       status,
       referencesIds,
+      columnWidth: columnWidth ?? defaultColumnWidth,
     };
   };
 
@@ -67,6 +75,7 @@ class StatusReferences extends ImmutablePureComponent {
     referencesIds: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   state = {
@@ -154,8 +163,18 @@ class StatusReferences extends ImmutablePureComponent {
     this.setState({ fullscreen: isFullscreen() });
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['status_references', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { status, referencesIds, intl, multiColumn } = this.props;
+    const { status, referencesIds, intl, multiColumn, columnWidth } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -173,10 +192,12 @@ class StatusReferences extends ImmutablePureComponent {
     }
 
     return (
-      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.detailedStatus)}>
+      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.detailedStatus)} columnWidth={columnWidth}>
         <ColumnHeader
           showBackButton
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><Icon id={status.get('hidden') ? 'eye-slash' : 'eye'} /></button>
           )}
diff --git a/app/javascript/mastodon/features/subscribing/index.js b/app/javascript/mastodon/features/subscribing/index.js
index 5f7e418ed..ac32c6855 100644
--- a/app/javascript/mastodon/features/subscribing/index.js
+++ b/app/javascript/mastodon/features/subscribing/index.js
@@ -18,7 +18,8 @@ import ColumnSettingsContainer from '../account_timeline/containers/column_setti
 import HeaderContainer from '../account_timeline/containers/header_container';
 import ScrollableList from '../../components/scrollable_list';
 import MissingIndicator from 'mastodon/components/missing_indicator';
-import { new_features_policy } from 'mastodon/initial_state';
+import { new_features_policy, defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
 
 const messages = defineMessages({
   title: { id: 'column.account', defaultMessage: 'Account' },
@@ -31,6 +32,7 @@ const mapStateToProps = (state, props) => ({
   isLoading: state.getIn(['user_lists', 'subscribing', props.params.accountId, 'isLoading'], true),
   blockedBy: state.getIn(['relationships', props.params.accountId, 'blocked_by'], false),
   advancedMode: state.getIn(['settings', 'account', 'other', 'advancedMode'], new_features_policy === 'conservative' ? false : true),
+  columnWidth: state.getIn(['settings', 'account', 'columnWidth'], defaultColumnWidth),
 });
 
 export default @connect(mapStateToProps)
@@ -46,6 +48,7 @@ class Subscribing extends ImmutablePureComponent {
     blockedBy: PropTypes.bool,
     isAccount: PropTypes.bool,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   componentWillMount () {
@@ -70,12 +73,16 @@ class Subscribing extends ImmutablePureComponent {
     this.column.scrollTop();
   }
 
+  handleWidthChange = (value) => {
+    this.props.dispatch(changeSetting(['account', 'columnWidth'], value));
+  }
+
   setRef = c => {
     this.column = c;
   }
 
   render () {
-    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, intl } = this.props;
+    const { accountIds, hasMore, blockedBy, isAccount, multiColumn, isLoading, columnWidth, intl } = this.props;
 
     if (!isAccount) {
       return (
@@ -96,7 +103,7 @@ class Subscribing extends ImmutablePureComponent {
     const emptyMessage = blockedBy ? <FormattedMessage id='empty_column.account_unavailable' defaultMessage='Profile unavailable' /> : <FormattedMessage id='account.subscribes.empty' defaultMessage="This user doesn't subscribe anyone yet." />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user'
           active={false}
@@ -104,6 +111,8 @@ class Subscribing extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={false}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
         >
           <ColumnSettingsContainer />
         </ColumnHeader>
diff --git a/app/javascript/mastodon/features/suggestions/index.js b/app/javascript/mastodon/features/suggestions/index.js
index f19d5dccf..6131c60b0 100644
--- a/app/javascript/mastodon/features/suggestions/index.js
+++ b/app/javascript/mastodon/features/suggestions/index.js
@@ -11,6 +11,9 @@ import ScrollableList from 'mastodon/components/scrollable_list';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import AccountContainer from 'mastodon/containers/account_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   heading: { id: 'suggestions.heading', defaultMessage: 'Suggestions' },
@@ -18,10 +21,18 @@ const messages = defineMessages({
   dismissSuggestion: { id: 'suggestions.dismiss', defaultMessage: 'Dismiss suggestion' },
 });
 
-const mapStateToProps = state => ({
-  suggestions: state.getIn(['suggestions', 'items']),
-  isLoading: state.getIn(['suggestions', 'isLoading'], true),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'suggestions', 'columnWidth']);
+
+  return {
+    suggestions: state.getIn(['suggestions', 'items']),
+    isLoading: state.getIn(['suggestions', 'isLoading'], true),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -33,6 +44,7 @@ class Suggestions extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     isLoading: PropTypes.bool,
   };
 
@@ -75,14 +87,24 @@ class Suggestions extends ImmutablePureComponent {
     this.column = c;
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['suggestions', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, suggestions, columnId, multiColumn, isLoading } = this.props;
+    const { intl, suggestions, columnId, multiColumn, isLoading, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.suggestions' defaultMessage='No one has suggestions yet.' />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='user-plus'
           title={intl.formatMessage(messages.heading)}
@@ -91,6 +113,8 @@ class Suggestions extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           showBackButton
         />
 
diff --git a/app/javascript/mastodon/features/trends/index.js b/app/javascript/mastodon/features/trends/index.js
index 7af077282..f6ddd6a3d 100644
--- a/app/javascript/mastodon/features/trends/index.js
+++ b/app/javascript/mastodon/features/trends/index.js
@@ -12,6 +12,9 @@ import ScrollableList from 'mastodon/components/scrollable_list';
 import Hashtag from 'mastodon/components/hashtag';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import { defaultColumnWidth } from 'mastodon/initial_state';
+import { changeSetting } from '../../actions/settings';
+import { changeColumnParams } from '../../actions/columns';
 
 const messages = defineMessages({
   heading: { id: 'trends.heading', defaultMessage: 'Trends' },
@@ -19,10 +22,18 @@ const messages = defineMessages({
   refresh: { id: 'refresh', defaultMessage: 'Refresh' },
 });
 
-const mapStateToProps = state => ({
-  trends: state.getIn(['trends', 'items']),
-  isLoading: state.getIn(['trends', 'isLoading'], true),
-});
+const mapStateToProps = (state, { columnId }) => {
+  const uuid = columnId;
+  const columns = state.getIn(['settings', 'columns']);
+  const index = columns.findIndex(c => c.get('uuid') === uuid);
+  const columnWidth = (columnId && index >= 0) ? columns.get(index).getIn(['params', 'columnWidth']) : state.getIn(['settings', 'trends', 'columnWidth']);
+
+  return {
+    trends: state.getIn(['trends', 'items']),
+    isLoading: state.getIn(['trends', 'isLoading'], true),
+    columnWidth: columnWidth ?? defaultColumnWidth,
+  };
+};
 
 export default @connect(mapStateToProps)
 @injectIntl
@@ -34,6 +45,7 @@ class Trends extends ImmutablePureComponent {
     intl: PropTypes.object.isRequired,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
+    columnWidth: PropTypes.string,
     isLoading: PropTypes.bool,
   };
 
@@ -81,14 +93,24 @@ class Trends extends ImmutablePureComponent {
     this.column = c;
   }
 
+  handleWidthChange = (value) => {
+    const { columnId, dispatch } = this.props;
+
+    if (columnId) {
+      dispatch(changeColumnParams(columnId, 'columnWidth', value));
+    } else {
+      dispatch(changeSetting(['trends', 'columnWidth'], value));
+    }
+  }
+
   render () {
-    const { intl, trends, columnId, multiColumn, isLoading } = this.props;
+    const { intl, trends, columnId, multiColumn, isLoading, columnWidth } = this.props;
     const pinned = !!columnId;
 
     const emptyMessage = <FormattedMessage id='empty_column.trends' defaultMessage='No one has trends yet.' />;
 
     return (
-      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)}>
+      <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.heading)} columnWidth={columnWidth}>
         <ColumnHeader
           icon='line-chart'
           title={intl.formatMessage(messages.heading)}
@@ -97,6 +119,8 @@ class Trends extends ImmutablePureComponent {
           onClick={this.handleHeaderClick}
           pinned={pinned}
           multiColumn={multiColumn}
+          columnWidth={columnWidth}
+          onWidthChange={this.handleWidthChange}
           showBackButton
           extraButton={(
             <button className='column-header__button' title={intl.formatMessage(messages.refresh)} aria-label={intl.formatMessage(messages.refresh)} onClick={this.handleRefresh}><Icon id='refresh' /></button>
diff --git a/app/javascript/mastodon/features/ui/components/column.js b/app/javascript/mastodon/features/ui/components/column.js
index 15538ea38..187101136 100644
--- a/app/javascript/mastodon/features/ui/components/column.js
+++ b/app/javascript/mastodon/features/ui/components/column.js
@@ -4,6 +4,7 @@ import PropTypes from 'prop-types';
 import { debounce } from 'lodash';
 import { scrollTop } from '../../../scroll';
 import { isMobile } from '../../../is_mobile';
+import classNames from 'classnames';
 
 export default class Column extends React.PureComponent {
 
@@ -13,6 +14,7 @@ export default class Column extends React.PureComponent {
     children: PropTypes.node,
     active: PropTypes.bool,
     hideHeadingOnMobile: PropTypes.bool,
+    columnWidth: PropTypes.string,
   };
 
   handleHeaderClick = () => {
@@ -47,7 +49,7 @@ export default class Column extends React.PureComponent {
   }
 
   render () {
-    const { heading, icon, children, active, hideHeadingOnMobile } = this.props;
+    const { heading, icon, children, active, hideHeadingOnMobile, columnWidth } = this.props;
 
     const showHeading = heading && (!hideHeadingOnMobile || (hideHeadingOnMobile && !isMobile(window.innerWidth)));
 
@@ -60,7 +62,7 @@ export default class Column extends React.PureComponent {
         ref={this.setRef}
         role='region'
         aria-labelledby={columnHeaderId}
-        className='column'
+        className={classNames('column', columnWidth)}
         onScroll={this.handleScroll}
       >
         {header}
diff --git a/app/javascript/mastodon/initial_state.js b/app/javascript/mastodon/initial_state.js
index f7079d5b3..d24bfaf54 100644
--- a/app/javascript/mastodon/initial_state.js
+++ b/app/javascript/mastodon/initial_state.js
@@ -52,5 +52,6 @@ export const maxReferences = initialState?.status_references?.max_references;
 export const matchVisibilityOfReferences = getMeta('match_visibility_of_references');
 export const enableEmptyColumn = getMeta('enable_empty_column');
 export const showReloadButton = getMeta('show_reload_button');
+export const defaultColumnWidth = getMeta('default_column_width');
 
 export default initialState;
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index 8dc233d00..dcef07bb4 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -140,6 +140,11 @@
   "column_subheading.favourite_lists": "Favourite lists",
   "column_subheading.favourite_tags": "Favourite tags",
   "column_subheading.settings": "Settings",
+  "column_width.free": "Free",
+  "column_width.x080": "80%",
+  "column_width.x100": "100%",
+  "column_width.x125": "125%",
+  "column_width.x150": "150%",
   "community.column_settings.local_only": "Local only",
   "community.column_settings.media_only": "Media only",
   "community.column_settings.remote_only": "Remote only",
diff --git a/app/javascript/mastodon/locales/ja.json b/app/javascript/mastodon/locales/ja.json
index d4a453d06..c5f4af3bc 100644
--- a/app/javascript/mastodon/locales/ja.json
+++ b/app/javascript/mastodon/locales/ja.json
@@ -140,6 +140,11 @@
   "column_subheading.favourite_lists": "お気に入りリスト",
   "column_subheading.favourite_tags": "お気に入りハッシュタグ",
   "column_subheading.settings": "設定",
+  "column_width.free": "フリー",
+  "column_width.x080": "80%",
+  "column_width.x100": "100%",
+  "column_width.x125": "125%",
+  "column_width.x150": "150%",
   "community.column_settings.local_only": "ローカルのみ表示",
   "community.column_settings.media_only": "メディアのみ表示",
   "community.column_settings.remote_only": "リモートのみ表示",
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index a0c19f7d0..326f0dcda 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -2346,6 +2346,57 @@ a.account__display-name {
   > .scrollable {
     background: $ui-base-color;
   }
+
+  .layout-multiple-columns &.free {
+    flex: 1 1 auto;
+    min-width: 350px;
+  }
+
+  .layout-multiple-columns &.x080 {
+    width: 350px * 0.8;
+
+    .status__action-bar {
+      zoom: 0.8;
+    }
+  }
+
+  .layout-multiple-columns &.x125 {
+    width: 350px * 1.25;
+  }
+
+  .layout-multiple-columns &.x150 {
+    width: 350px * 1.5;
+  }
+
+  .layout-multiple-columns &.x200 {
+    width: 350px * 2;
+  }
+}
+
+.column-width {
+  display: flex;
+  justify-content: flex-end;
+  padding-bottom: 8px;
+  margin-bottom: 10px;
+
+  &__item {
+    flex: 0 0 auto;
+    min-width: 36px;
+    padding: 4px;
+    margin: 0 2px;
+    border-radius: 4px;
+    text-align: center;
+    background-color: $ui-base-color;
+  }
+
+  &__item.active {
+    color: $primary-text-color;
+    background-color: $ui-highlight-color;
+  }
+
+  input[type=radio] {
+    display: none;
+  }
 }
 
 .ui {
diff --git a/app/lib/user_settings_decorator.rb b/app/lib/user_settings_decorator.rb
index 243ec1577..4eda7a581 100644
--- a/app/lib/user_settings_decorator.rb
+++ b/app/lib/user_settings_decorator.rb
@@ -89,6 +89,7 @@ class UserSettingsDecorator
     user.settings['confirm_follow_from_bot']           = confirm_follow_from_bot_preference if change?('setting_confirm_follow_from_bot')
     user.settings['default_search_searchability']      = default_search_searchability_preference if change?('setting_default_search_searchability')
     user.settings['show_reload_button']                = show_reload_button_preference if change?('setting_show_reload_button')
+    user.settings['default_column_width']              = default_column_width_preference if change?('setting_default_column_width')
 end
 
   def merged_notification_emails
@@ -331,6 +332,10 @@ end
     boolean_cast_setting 'setting_show_reload_button'
   end
 
+  def default_column_width_preference
+    settings['setting_default_column_width']
+  end
+
   def boolean_cast_setting(key)
     ActiveModel::Type::Boolean.new.cast(settings[key])
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index 9a0e3de7a..f2efad61f 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -142,7 +142,7 @@ class User < ApplicationRecord
            :mobile_customize, :mobile_content_font_size, :mobile_info_font_size, :mobile_content_emoji_reaction_size,
            :hide_bot_on_public_timeline, :confirm_follow_from_bot,
            :default_search_searchability,
-           :show_reload_button,
+           :show_reload_button, :default_column_width,
 
            to: :settings, prefix: :setting, allow_nil: false
 
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index da52345b0..e7f17e946 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -72,6 +72,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:hide_bot_on_public_timeline]       = object.current_account.user.setting_hide_bot_on_public_timeline
       store[:confirm_follow_from_bot]           = object.current_account.user.setting_confirm_follow_from_bot
       store[:show_reload_button]                = object.current_account.user.setting_show_reload_button
+      store[:default_column_width]              = object.current_account.user.setting_default_column_width
     else
       store[:auto_play_gif] = Setting.auto_play_gif
       store[:display_media] = Setting.display_media
diff --git a/app/views/settings/preferences/appearance/show.html.haml b/app/views/settings/preferences/appearance/show.html.haml
index 3406bb938..42aae6abc 100644
--- a/app/views/settings/preferences/appearance/show.html.haml
+++ b/app/views/settings/preferences/appearance/show.html.haml
@@ -62,6 +62,9 @@
   .fields-group
     = f.input :setting_enable_empty_column, as: :boolean, wrapper: :with_label, fedibird_features: true
 
+  .fields-group
+    = f.input :setting_default_column_width, collection: ['x080', 'x100', 'x125', 'x150', 'free'], label_method: lambda { |item| t("simple_form.hints.defaults.setting_default_column_width_#{item}") }, wrapper: :with_label, include_blank: false, fedibird_features: true
+
   %h4= t 'appearance.animations_and_accessibility'
 
   .fields-group
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index 32ad9c90b..3402fbc66 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -57,6 +57,11 @@ en:
         setting_aggregate_reblogs: Do not show new boosts for posts that have been recently boosted (only affects newly-received boosts)
         setting_compact_reaction: Emoji reaction display to be only the number of cases, except for the detail display
         setting_confirm_follow_from_bot: Manually approve followers from bot accounts 
+        setting_default_column_width_free: Free - Column width changes according to screen
+        setting_default_column_width_x080: 80% - Fix to 80% of standard width
+        setting_default_column_width_x100: 100% - Fix to Mastodon standard column width
+        setting_default_column_width_x125: 125% - Fix to 125% of standard width
+        setting_default_column_width_x150: 150% - Fix to 150% of standard width
         setting_default_search_searchability: For clients that do not support advanced range settings, switch the settings here. Mastodon's standard behavior is "Reacted-users-only". Targeting "Public" makes it easier to discover unknown information, but if the results are noisy, narrowing the search range is effective.
         setting_default_sensitive: Sensitive media is hidden by default and can be revealed with a click
         setting_disable_joke_appearance: Disable April Fools' Day and other joke functions
@@ -219,6 +224,7 @@ en:
         setting_content_emoji_reaction_size: Emoji reaction size
         setting_content_font_size: Content font size
         setting_crop_images: Crop images in non-expanded posts to 16x9
+        setting_default_column_width: Default column width
         setting_default_language: Posting language
         setting_default_privacy: Posting privacy
         setting_default_search_searchability: Search range
diff --git a/config/locales/simple_form.ja.yml b/config/locales/simple_form.ja.yml
index ac5e44f6c..ede5d861d 100644
--- a/config/locales/simple_form.ja.yml
+++ b/config/locales/simple_form.ja.yml
@@ -57,6 +57,11 @@ ja:
         setting_aggregate_reblogs: 最近ブーストされた投稿が新たにブーストされても表示しません (設定後受信したものにのみ影響)
         setting_compact_reaction: 詳細表示以外の絵文字リアクション表示を件数のみにする
         setting_confirm_follow_from_bot: Botアカウントからのフォローを手動で承認する
+        setting_default_column_width_free: フリー - 画面に応じてカラム幅が変わります
+        setting_default_column_width_x080: 80% - 標準の80%の幅に固定します
+        setting_default_column_width_x100: 100% - Mastodon標準のカラム幅に固定します
+        setting_default_column_width_x125: 125% - 標準の125%の幅に固定します
+        setting_default_column_width_x150: 150% - 標準の150%の幅に固定します
         setting_default_search_searchability: 範囲の詳細設定に対応していないクライアントでは、ここで設定を切り替えてください。Mastodonの標準動作は『リアクション限定』です。『公開』を対象にすると未知の情報を発見しやすくなりますが、結果にノイズが多い場合は検索範囲を狭めると効果的です。
         setting_default_sensitive: 閲覧注意状態のメディアはデフォルトでは内容が伏せられ、クリックして初めて閲覧できるようになります
         setting_disable_joke_appearance: エイプリルフール等のジョーク機能を無効にします
@@ -219,6 +224,7 @@ ja:
         setting_content_emoji_reaction_size: 投稿の絵文字リアクションのサイズ
         setting_content_font_size: 投稿のフォントサイズ
         setting_crop_images: 投稿の詳細以外では画像を16:9に切り抜く
+        setting_default_column_width: デフォルトのカラム幅
         setting_default_language: 投稿する言語
         setting_default_privacy: 投稿の公開範囲
         setting_default_search_searchability: 検索の対象とする範囲
diff --git a/config/settings.yml b/config/settings.yml
index 521a214ea..4596601a6 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -110,6 +110,7 @@ defaults: &defaults
   confirm_follow_from_bot: true
   default_search_searchability: 'private'
   show_reload_button: true
+  default_column_width: 'x100'
 
 development:
   <<: *defaults