Undo & Redo
You can use Undo and Redo to go back or forward 1 step at a time through your changes history.
Undo and Redo work the same as with any other app.
Please do note that each canvas (template side) has its own history and its own Undo and Redo links. So, if you're on the Back side and click Undo until the end of the history, it will only revert your actions for the Back side.