I'm wondering if anyone else has had the experience of the zoom mode changing unpredictably. It may be related to my two work stations: I work on a MacBook Pro and go back and forth between home and office, connecting to two different desktop screens. I haven't observed closely enough to see if the change happens with changing monitors, but it wouldn't make sense if it did anyway.
I work well enough with both modes, but it's very annoying.
Sorry to hear about the trouble you are facing. I would request you to try the following steps and let us know how it goes:
Update macOS to Big Sur or above if not done already
Manually reset preferences & caches: ~/Library/Caches ~/Library/Preferences Rename Adobe InDesign and com.adobe.InDesign to Adobe InDesign.old and com.adobe.InDesign.old and launch InDesign from the Creative Cloud app
Rename the CEP folder to CEP.old from the following location: /Library/Application Support/Adobe
If that doesn't help, rename the extensions folder to extensions.old in the following location: /Library/Application Support/Adobe/UXP