You can step back as far as the first item in your history panel. This command, which is available in the edit menu, will step backwards in the History Panel, and is basically a multilevel Undo. The Ctrl+z (Command Z in Mac) function to perform is called 'step back' in Photoshop terms. Photoshop undo shortcut ctrl z not working Then this is the right place to solve the problems of undo in Photoshop, Photoshop undo shortcut and Photoshop undo limit, photoshop ctrl z multiple. Photoshop Ctrl z not working-If you are looking Photoshop shortcuts not working.