diff --git a/lib/hooks/promote-sidebar.react.js b/lib/hooks/promote-sidebar.react.js
--- a/lib/hooks/promote-sidebar.react.js
+++ b/lib/hooks/promote-sidebar.react.js
@@ -9,8 +9,8 @@
 import { createLoadingStatusSelector } from '../selectors/loading-selectors.js';
 import { threadInfoSelector } from '../selectors/thread-selectors.js';
 import {
-  threadHasPermission,
   threadIsSidebar,
+  useThreadHasPermission,
 } from '../shared/thread-utils.js';
 import type { LoadingStatus } from '../types/loading-types.js';
 import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
@@ -19,23 +19,24 @@
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
 import { useSelector } from '../utils/redux-utils.js';
 
-function canPromoteSidebar(
+function useCanPromoteSidebar(
   sidebarThreadInfo: ThreadInfo,
   parentThreadInfo: ?ThreadInfo,
 ): boolean {
-  if (!threadIsSidebar(sidebarThreadInfo)) {
-    return false;
-  }
-
-  const canChangeThreadType = threadHasPermission(
+  const canChangeThreadType = useThreadHasPermission(
     sidebarThreadInfo,
     threadPermissions.EDIT_PERMISSIONS,
   );
-  const canCreateSubchannelsInParent = threadHasPermission(
+  const canCreateSubchannelsInParent = useThreadHasPermission(
     parentThreadInfo,
     threadPermissions.CREATE_SUBCHANNELS,
   );
-  return canChangeThreadType && canCreateSubchannelsInParent;
+
+  return (
+    threadIsSidebar(sidebarThreadInfo) &&
+    canChangeThreadType &&
+    canCreateSubchannelsInParent
+  );
 }
 
 type PromoteSidebarType = {
@@ -60,7 +61,7 @@
     parentThreadID ? threadInfoSelector(state)[parentThreadID] : null,
   );
 
-  const canPromote = canPromoteSidebar(threadInfo, parentThreadInfo);
+  const canPromote = useCanPromoteSidebar(threadInfo, parentThreadInfo);
 
   const onClick = React.useCallback(() => {
     try {
@@ -91,4 +92,4 @@
   return returnValues;
 }
 
-export { usePromoteSidebar, canPromoteSidebar };
+export { usePromoteSidebar, useCanPromoteSidebar };
diff --git a/web/modals/threads/notifications/notifications-modal.react.js b/web/modals/threads/notifications/notifications-modal.react.js
--- a/web/modals/threads/notifications/notifications-modal.react.js
+++ b/web/modals/threads/notifications/notifications-modal.react.js
@@ -6,7 +6,7 @@
   useUpdateSubscription,
   updateSubscriptionActionTypes,
 } from 'lib/actions/user-actions.js';
-import { canPromoteSidebar } from 'lib/hooks/promote-sidebar.react.js';
+import { useCanPromoteSidebar } from 'lib/hooks/promote-sidebar.react.js';
 import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
 import { threadIsSidebar } from 'lib/shared/thread-utils.js';
 import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
@@ -192,6 +192,7 @@
     ? 'Thread notifications'
     : 'Channel notifications';
 
+  const canPromoteSidebar = useCanPromoteSidebar(threadInfo, parentThreadInfo);
   const noticeText = React.useMemo(() => {
     if (!isSidebar) {
       return null;
@@ -207,7 +208,7 @@
             'must also be there.'}
         </p>
         <p className={css.notice}>
-          {canPromoteSidebar(threadInfo, parentThreadInfo)
+          {canPromoteSidebar
             ? 'If you want to move this thread to Background, ' +
               'you can either move the parent to Background, ' +
               'or you can promote the thread to a channel.'
@@ -216,7 +217,7 @@
         </p>
       </>
     );
-  }, [isSidebar, parentThreadInfo, threadInfo]);
+  }, [isSidebar, canPromoteSidebar]);
 
   const parentThreadIsInBackground =
     isSidebar && !parentThreadInfo?.currentUser.subscription.home;
@@ -233,7 +234,7 @@
               'thread must also be there.'}
           </p>
           <p>
-            {canPromoteSidebar(threadInfo, parentThreadInfo)
+            {canPromoteSidebar
               ? 'If you want to change the notif settings for this thread, ' +
                 'you can either change the notif settings for the parent, ' +
                 'or you can promote the thread to a channel.'
@@ -259,9 +260,8 @@
     focusedBadgeOnlyItem,
     focusedItem,
     noticeText,
-    parentThreadInfo,
     parentThreadIsInBackground,
-    threadInfo,
+    canPromoteSidebar,
   ]);
 
   const saveButton = React.useMemo(() => {