I have the same problem as the thread below. After updating to Big Sur my second screen won't use a dark mode menu and dock. I tried multiple reboots with different setting but notting works. And nightshift isn't working any more too..
If I turn on "reduce transparency" the menu bar turn dark, but that not the solution that I want.
MacBook Pro mid 2014, 11.0.1
https://discussions.apple.com/thread/8084557?answerId=32275177022
If I turn on "reduce transparency" the menu bar turn dark, but that not the solution that I want.
MacBook Pro mid 2014, 11.0.1
https://discussions.apple.com/thread/8084557?answerId=32275177022