One of my computerr runs macOS. I easly I turned off the option to automatic'ly keep tke Mac updated, and received occasional notices about updates available for apps or the system. This allowed me to hold onto 11.x until the end of this month, by letting me selectively install updates instead of getting macOS 'major version' upgrades (meaning, no features I need, and minor downgrades and rearrangements I could avoid).

If only I had done kept a copy of 10.whateverMojaveWas so I could, by means of a simple network disconnect and reboot, sidestep the removal of 32-bit support. (-: