A family of Microsoft word processing software products for creating web, email, and print documents.
If you go to File > Account (or File > Office Account in Outlook), you can click Update Options > Disable Updates.
I don't know whether Microsoft honors this option, as I've never tried it, but it may work.
I get Microsoft 365 updates at least monthly, but I haven't seen either of the problems that were mentioned. "Always create backup copy" remains turned off, and pages print as they should and not reduced (the latter may be caused by having tracked changes and/or comments in the document, although that would push the page's text to the left rather than to the center and doesn't add a border).