Use Undo to reverse the last action that has been applied to the picture on the screen, such as moving, deleting or mirroring an area. Unlimited Undos are possible. Every time you use Undo, the previous action is reversed. If you are not satisfied with the result of the Undo, you can use Redo.
Note: The Zoom commands cannot be reversed using Undo.
To use Undo
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Click Actions
on the toolbar and choose Undo. -
Choose Edit > Undo.
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Press ⌘Z
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Control–click and choose Undo.
Note: When using Undo from the Edit menu, the name of the specific action to be undone is listed.