Monitor settings on Menu Bar missing
In Catalina my MacBook Pro 2018 with external monitor used to be able to display a small icon on the menu bar which allowed me to access settings like the screen resolution quickly.
If I go into display settings via System Prefs there is a checkbox which asks if you want to see this item on the menu - but it never appears.
I spoke to someone at apple who could replicate the problem. They have escalated the issue but apparently not all users are effected. I have 2 monitors if you count the laptop build in one. Maybe Big Sur only considers external monitors and therefore does not show the menu items on a MacBook.
I have the same issue on a MacBook Pro Late 2013 + Apple Thunderbolt display and my MacBook Pro 2018 + Benq 4k Monitor.
Dave
MacBook Pro with Touch Bar