Zitat von mpachmann am 5. April 2023, 9:29 Uhr

https://discussions.apple.com/thread/253389827

You have to make sure the new "Focus" icon is visible when Focus mode is active, otherwise the clock becomes unreadable.

Go to Settings -> Dock & Menu Bar > Focus and change the setting to "When active".

My theory is that there needed to be a way to know if Focus mode was enabled even if you hide the little icon, so hiding the clock was their way? Somehow the clock widget is related to the Focus setting since you can option-click the clock and it will toggle Focus mode on and off, making the clock visible again.