[fluidcruft]

Hmmm, I have my toolbar on the bottom and don't have anything in the upper right at all. Dunno what that could be. The location of the toolbar (menu/address/etc) can be set top or bottom in preferences (Settings >> Customize >> Toolbar).

I have my toolbar set to auto hide to maximize screen space for reading and bottom works better for me because when you scroll to the top, the hidden toolbar reappears at the bottom before pulling further to refresh. It seems like hiding/unhiding the toolbar at the top would be super annoying because it would either jump over the top of the page or jerk the page up and down under my finger as it hides/unhides.

(FWIW: I'm on a Pixel running Android 11 so dunno if there could be an Android version level or manufacturer overlay issue causing your menu to split, or maybe it's an iOS feature)