Use Redo to reverse the last action that was undone by Undo. If you are not satisfied with the result, click Undo.
There are unlimited Redo steps. Redo steps are only lost when you use New.
To use Redo
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Click Actions
on the toolbar and choose Redo. -
Choose Edit > Redo.
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Press ⇧⌘Z
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Control–click and choose Redo.