Bluetooth "pop-up" over menu bar

I am troubleshooting a problematic NVME + enclosure and so I restarted by Macbook Air, and when it restarted, I now have this pop-up that announces whether Bluetooth is on or off OVER my menu bar:

Does anyone have any idea (1) what this is or how this happened and (2) how to make it go away?

It looks like a part of the control center being stuck? That is weird and apparently seems to be a bug (?) that is out there quite some time. I have not experienced this myself before.

https://www.reddit.com/r/MacOS/comments/1c7kunc/what_the_heck_is_this_big_bluetooth_thing_that_is/

What happens if you restart your Macbook again? It should go away?

Another option from the Reddit thread I posted above:

  1. Open Terminal
  2. type killall ControlCenter
  3. press Enter

Also interesting and maybe an idea for further debugging:

https://discussions.apple.com/thread/253886551

On the fly you can relaunch the menubar from the Terminal.app copy and paste:
killall -KILL SystemUIServer

Clearing caches may be an idea, too:

(Clearing system caches also can be achieved booting into safe mode and restarting normally after that.)

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Yes, sorry for not replying sooner!, but, yes, it went away with another restart. Thank you for your detailed reply!

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