Could someone please tell me what this is and how I can turn off this annoying red square? I guess it's some kind of AI tool or AI tip that's ruining my scrolling and navigation in my Illustrator file.
The expert is correct. You can disable it by going to Edit > Preferences > General and unchecking the option for Show print bleed generative AI button on bleed.
Give that a try and let me know if the red square is gone.
Disclaimer: Please note that renaming preferences folders will remove all the custom settings, and Illustrator will launch with default settings. You can also save a backup of the folders in case you want to. The location is mentioned above.