Because Pro Tools needs to keep track of the playlists for all tracks that are edited, the use of multiple levels of Undo can be memory intensive. You can lower the Levels of Undo setting (Editing Preferences) in Pro Tools to reduce the amount of system memory (RAM) used by the Undo queue. If you have plenty of memory available for Pro Tools, you can use a higher Levels Of Undo setting.
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Use the Undo History window to view a queue of undo operations and return to a previous state.