Like above, sometimes there appears a black bar and it does not disappear after restart the browser.
This only occurs when the window is maximized.
Interaction with interface elements hidden by that bar is unavailable.
Killing all chromium-edge related process and restarting browser does not clear that box. But rebooting the computer is effective. "Log out and Re-login without reboot" is not tested.
Sometimes the box is white. In this case, it works as "nothing in there". This means if I open an powershell and maximize the window, and then open edge with white box, then dragging from the browser title bar (tab list) position to downside make "the powershell window" comes out with its title bar grabbed.
I have same problem here. I am running Version 81.0.381.0 (Official build) dev (64-bit) and Windows 1909. Restarting PC didn't resolve the issue.
I am using two displays (in extend mode). If i get the browser window to my second display it is ok but when maximize window on main display black bar appears again. I removed second display (did PC screen only) and add it again (to extend mode) issue resolved.