Working with Oracle Smart View for Office General Operations Using Undo and Redo Specifying the Number of Undo and Redo Actions Specifying the Number of Undo and Redo Actions To specify the number of permitted undo and redo actions: From the Oracle Smart View for Office ribbon, select Options, then select Advanced in the left panel. In Number of Undo Actions, specify the number of permissible Undo operations, 0 through 100. This is also the number of Redo operations permitted. Click OK. The setting takes effect after you refresh or perform a drill operation.