Undo Data preferences

I read somewhere that there is a preference that erases your undo data when you quit your project.I have tried looking for this but can not find it,could someone give me a little help please? Many thanks

Preferences>Audio>Sample Editor tab
Don't use it myself, but its location suggests it only applies to the .. you guessed it.
I should add that just automatically erasing all the undo data for the project is a new unchangeable behavior in L9.
Message was edited by: seeren

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