Undo Command
Use the Edit menu Undo command to undo your last action in the viewer.
You can undo the following types of action.
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Last single keystroke
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Cut
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Paste
This command is disabled when a command cannot be undone; that is, you have not previously performed an action in the viewer that can be undone.
To undo your last action, perform one of the following actions
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Select the Undo command from the Edit menu
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Press Ctrl+Z
Your last single action is then undone.
You can use this command to undo only the last action that you performed. You cannot undo a sequence of previous actions.