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Change the Number of Undos
You can change the number of times you can undo an action in Frames. The more undos you allow, the more memory it takes to run Frames. Go to the Edit menu and choose Preferences.
You will see the Preferences dialog.
Click the Undo History
Limit pull-down menu and choose the number of actions you want to be able to undo.
Click the OK
The undo limit will change immediately.