It could be the individual documents and how the versions of Acrobat, with (Windows) and without (MacOS) operating system component access, handle them. I used to train Adobe Technical Support (North America). I've been troubleshooting PDFs for 30 years. You're not necessarily wrong--it could very well be a bug in Acrobat for Mac (that's why I turned off its ability to update itself on my Mac 18 months ago and never regretted it)--but much more often, it's the way the PDFs are created, which sets the code inside the PDFs, that cause problems with Acrobat or any other PDF reader/editor. If we can eliminate that possibility, we can focus on other troubleshooting steps to get your documents working for you. If you just want to try turning off the new UI, that's simple. Follow my instructions here: https://community.adobe.com/t5/acrobat-discussions/new-acrobat-pro-and-reader-tool-buttons-have-been-hidden-relocated-or-completely-removed/m-p/14764082#M472500
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