Specifying the Number of Undo and Redo Actions
You can specify the number of actions permitted for undo and redo. The setting takes effect after you refresh or perform a drill operation.
To specify the number of permitted undo and redo actions:
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From the Smart View ribbon, select Options.
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In the Advanced tab, in Number of Undo Actions, specify the number of permissible Undo operations, 0 through 100.