Tag Group Editor missing back or revert changes button

The new Tag Group Editor allows for a “Driving Expression” for driven mode. When you select this pencil (edit) icon it takes you to the editor screen. But there is no way to return back if you choose to not make any changes. If you press cancel, the whole Tag Group Editor window closes. I feel there should be a ← Back button similar to when you edit alarms or a revert button. This is as of version 8.1.4.