Undoing and redoing actions
When you make changes to a file, you can reverse the effects of your previous actions and commands.
Note
If two people are using your interactive product, pressing Undo and Redo affects the actions of both users.
To reverse the effect of the last action
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Press Undo .
Note
You can undo an unlimited number of actions.
To reinstate the last action reversed with the Undo command
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Press Redo .