diff --git a/src/components/structures/LeftPanel2.tsx b/src/components/structures/LeftPanel2.tsx
index 23a9e74646..aed0434b7b 100644
--- a/src/components/structures/LeftPanel2.tsx
+++ b/src/components/structures/LeftPanel2.tsx
@@ -266,6 +266,7 @@ export default class LeftPanel2 extends React.Component<IProps, IState> {
             onFocus={this.onFocus}
             onBlur={this.onBlur}
             isMinimized={this.props.isMinimized}
+            onResize={this.onResize}
         />;
 
         // TODO: Conference handling / calls: https://github.com/vector-im/riot-web/issues/14177
diff --git a/src/components/views/rooms/RoomList2.tsx b/src/components/views/rooms/RoomList2.tsx
index b0bb70c9a0..0c754b2c8d 100644
--- a/src/components/views/rooms/RoomList2.tsx
+++ b/src/components/views/rooms/RoomList2.tsx
@@ -55,6 +55,7 @@ interface IProps {
     collapsed: boolean;
     searchFilter: string;
     isMinimized: boolean;
+    onResize();
 }
 
 interface IState {
@@ -183,7 +184,9 @@ export default class RoomList2 extends React.Component<IProps, IState> {
             layoutMap.set(tagId, new ListLayout(tagId));
         }
 
-        this.setState({sublists: newLists, layouts: layoutMap});
+        this.setState({sublists: newLists, layouts: layoutMap}, () => {
+            this.props.onResize();
+        });
     };
 
     private renderCommunityInvites(): React.ReactElement[] {
@@ -256,6 +259,7 @@ export default class RoomList2 extends React.Component<IProps, IState> {
                     isInvite={aesthetics.isInvite}
                     layout={this.state.layouts.get(orderedTagId)}
                     isMinimized={this.props.isMinimized}
+                    onResize={this.props.onResize}
                     extraBadTilesThatShouldntExist={extraTiles}
                 />
             );
diff --git a/src/components/views/rooms/RoomSublist2.tsx b/src/components/views/rooms/RoomSublist2.tsx
index 21e7c581f0..a1abfb8c7c 100644
--- a/src/components/views/rooms/RoomSublist2.tsx
+++ b/src/components/views/rooms/RoomSublist2.tsx
@@ -66,6 +66,7 @@ interface IProps {
     layout: ListLayout;
     isMinimized: boolean;
     tagId: TagID;
+    onResize();
 
     // TODO: Don't use this. It's for community invites, and community invites shouldn't be here.
     // You should feel bad if you use this.
@@ -228,6 +229,7 @@ export default class RoomSublist2 extends React.Component<IProps, IState> {
     private toggleCollapsed = () => {
         this.props.layout.isCollapsed = !this.props.layout.isCollapsed;
         this.forceUpdate(); // because the layout doesn't trigger an update
+        setImmediate(() => this.props.onResize()); // needs to happen when the DOM is updated
     };
 
     private onHeaderKeyDown = (ev: React.KeyboardEvent) => {