Use Undo to reverse the last action. If you are not satisfied with the result, click Redo.
There are unlimited Undo steps. Undo steps are only lost when you use New.
Note: Each time you use Undo the undone action becomes a Redo.
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.