Undo Levels
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\ms project\options\general Options
undolevels decimal
- range 1-99 Description
Limits the number of actions (1-99) that a user can undo. If you enable this setting, you can set a limit on the number of actions (1-99) a user is can undo. If you disable this setting or do not configure it, the user's default setting is used.