In my Android phone, when I open File Editor the screen looks normal. When I touch a place to begin an edit, the screen magnifies to become unusable. I can pinch to reduce the magnification and type edits. Another touch magnifies the screen again. No other HA screen does this, only File Editor.
Good ideas. I found nothing in accessibility. I use Gboard and Samsung keyboards. Both behave the same. This happens only with File Manager.
Update: I found that even with Accessibility > Visual Enhancements > Magnifier turned off, my phone still magnifies in File Editor. Instead of ‘touch’ magnification, I set it to a side button. Magnification on touch no longer occurs.