Blank screen when adding categories to the navigation menu

Appreciate the responses - thanks. I have been testing but can’t seem to figure out the issue. I disabled all theme components and plugins, and still have the issue, which is that if I click the categories edit pencil, or the tiny keyboard at the bottom, the screen darkens properly but I’m never shown a dialog. Logs don’t seem to indicate anything wrong, and I can’t tell from the chrome console, either. I get the same behavior in firefox and edge as well.

The one thing that fixes it is to use safe mode. Appreciate any other clues/tips!