Undo is one of the simplest and most common tasks you can perform in most programs, but traditionally, it has always worked a little bit differently in Photoshop.
That changed with Photoshop CC 2019, in which you don't need to use a multi-key keyboard shortcut to go back and forth through your undo history.
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How to undo in Photoshop CC 2019 or later
Undo the same way you would in any other program:
1. Either click "Edit" and then "Undo" in the top menu, or press "CTRL" + "Z," or "command" + "Z" on Mac, on your keyboard.
2. Photoshop allows for multiple undos, so that each time you click "Undo" or use the shortcut on your keyboard, you undo the next most recent action, stepping back through your action history.
How to undo in older versions of Photoshop
1. Either choose "Edit" and then "Undo" from the top menu, or press "CTRL" + "Z," or "command" + "Z" on Mac, on your keyboard.
2. To perform multiple undo actions, stepping back through the history of your actions, you need to use the "Step Backwards" command instead. Click "Edit" and then "Step Backwards" or press "Shift" + "CTRL" + "Z," or "shift" + "command" + "Z" on Mac, on your keyboard for each undo you want to perform.
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