diff --git a/lib/permissions/thread-permissions.js b/lib/permissions/thread-permissions.js
--- a/lib/permissions/thread-permissions.js
+++ b/lib/permissions/thread-permissions.js
@@ -476,19 +476,31 @@
     [threadPermissions.EDIT_THREAD_COLOR]: true,
     [threadPermissions.EDIT_THREAD_DESCRIPTION]: true,
     [threadPermissions.EDIT_THREAD_AVATAR]: true,
-    [threadPermissions.ADD_MEMBERS]: true,
-    [threadPermissions.LEAVE_THREAD]: true,
   };
   if (threadType === threadTypes.THICK_SIDEBAR) {
     return {
       ...basePermissions,
       [threadPermissions.JOIN_THREAD]: true,
+      [threadPermissions.ADD_MEMBERS]: true,
+      [threadPermissions.LEAVE_THREAD]: true,
+    };
+  }
+  if (
+    threadType === threadTypes.PRIVATE ||
+    threadType === threadTypes.PERSONAL
+  ) {
+    return {
+      ...basePermissions,
+      [threadPermissions.EDIT_ENTRIES]: true,
+      [threadPermissions.CREATE_SIDEBARS]: true,
     };
   }
   return {
     ...basePermissions,
     [threadPermissions.EDIT_ENTRIES]: true,
     [threadPermissions.CREATE_SIDEBARS]: true,
+    [threadPermissions.ADD_MEMBERS]: true,
+    [threadPermissions.LEAVE_THREAD]: true,
   };
 }