This was originally designed to work with an Apple feature that is now long defunct.
If you are really serious about version tracking, the awesome way to do it in Panorama X is to export blueprints and track those with Git. That’s what I do. That topic is really way too complicated for me to get into here, but there is lots of material online about Git. The great thing is it allows you to track changes on a line by line basis (and for forms, track changes to individual properties), and go back at any time and see exactly what changed when. But it is a lot of work to set up and maintain, probably not worth it for the average Panorama developer.