Every time I enable Focus (every schedule I have) clock on menu bar becomes dark

i have noticed that when DND is turned on, the clock is dim.

but when it's off, it's bright.

i guess that's a feature to tell you it's status. but i have found that you can place the DND icon permanently on the menubar and the clock will stay bright regardless of if DND is turned off or on.

DND turned on:

DND turned off:

just open control centre and drag DND from control centre and drop it on your menubar. you drag it by the text, not the icon.

I came across this little tidbit when searching an issue with Big Sur some time back. Apparently it's a design feature.

"In past versions of macOS there was an icon that dimmed when you had Do Not 

Disturb on. It also worked to be a shortcut to turn Do Not Disturb on or off 

(option click). 

Now the icon is gone and it does it with the time -- same with the shortcut. 

Glad to have the functionality, but then the time becomes harder to read. 

I do not think there is a fix -- well, other than what I have done which is 

have my Calendar app set to show the date and time as well (and then set the 

date/time to be as small as possible). To make it even worse (not that this is 

THAT big of a deal), if you set the clock to be analog it no longer works as a 

short cut (or indicator)."

Unfortunately I do not remember the source, I printed the page to a .pdf for a different reason but remembered it being there.

There are several fixes brought with the update to Monterey 12.1 released Monday Dec 13, 2021.

Do not know for certain if this will fix or even need to fix your issue. Or if as already mentioned , designed to function this way.

As per the user profile indicating Monterey 12.0