To change undoing preferences, 

▪        Choose Preferences from the main window Edit menu. 

▪        Click the Undoing tab.

▪        Make your changes to the items below, then click OK. 

Undoing preferences that affect whole program

▪        Number of actions to keep in undo list, Number of plants to keep in undo list: See Changing the undo limitsChanging_the_undo_limits>second.

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