Unable to disable new version

We are running Acrobat version 2023.003.20244 on an HP Pavilion x360, and are having issues editing pdf files that we've been using for months and months.

Specifically, we need to "disable new version" (I'm told) in order to fix the issues.  I'm told we should click on the "three lines" menu at the top left when the application is open.

The trouble is, I don't see the "three lines" menu.  It's just not there.  I'm also told that I should be able to click on Help, and the drop-down menu will have a "disable new version" (or something like that) available.

Not the case.  I don't see that, either.

Any suggestions would be greatly appreciated.