diff --git a/TODO.md b/TODO.md
index 3781d45e..578dfad4 100644
--- a/TODO.md
+++ b/TODO.md
@@ -12,7 +12,6 @@
   - `MessageDelegate.qml:63: TypeError: 'reloadPreviousItem' not a function`
 
 - UI
-  - "the tree arrows could be smaller"
   - Accounts delegates background
   - Server selection
   - Register/Forgot? for SignIn dialog
diff --git a/harmonyqml/components/SidePane/RoomCategoryDelegate.qml b/harmonyqml/components/SidePane/RoomCategoryDelegate.qml
index 776f56c2..92204068 100644
--- a/harmonyqml/components/SidePane/RoomCategoryDelegate.qml
+++ b/harmonyqml/components/SidePane/RoomCategoryDelegate.qml
@@ -29,6 +29,7 @@ Column {
 
         ExpandButton {
             expandableItem: roomCategoryDelegate
+            iconDimension: 12
         }
     }