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Click Tools > Options to display the Options Dialog Box.
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On the General tab, select the Make Undo available check box to activate or deactivate the feature. A check mark indicates that the Undo command is available.
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When you enable the Make Undo available feature, you can specify the number of previous actions that can be canceled in the Number of undo actions list.
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Click Undo , or click Edit > Undo (CTRL + Z).