So I no longer have any Appearance settings other than Fonts in Edge Dev version 82.0.432.3 for Mac
I have also tried with all of my extensions disabled but no change.
Reinstalling didn't do anything either. Seems to potentially be an issue with the build maybe. Stable/release version is working fine for now.
So far it has only happened on Mac for me, my Windows PCs haven't had the issue. I only noticed because I didn't have the share button and when I went to Appearance Settings I didn't have those either