its slightly unintuitive for the undo history to be toggled on and off in the file>“undo history” setting. no matter what is set under preferences nothing will happen unless its turned on in the document. sure I get it but what makes it worse is that you cant store this setting to be ON for the default document. you need to turn it on every time.
solution: enable the saving of the “undo history” setting to preferences or the default doc. so the user doesn’t need to toggle it on/off all the time. or remove it and just rely on the settings under preferences to control if the user wants this feature. (having it also under file seems a little redundant. )