I upgraded to Windows 11 with no apparent installation issues. I use a laptop with an external monitor as a second display. In Windows 10, the placement of windows in either display remained stable where I placed them. A common setup is to have a full-screen program on Display 1 on the laptop, and browser and file manager windows on Display 2 on the external monitor.
But now, whenever I click on a window on Display 2, all of the windows jump around and usually land in display 1. This happens every time. I have searched for relevant settings in Settings->Display, but cannot get this sorted. Is there a setting which is different or missing in Windows 11? It has been too long since I set this up in Windows 10 for me to remember.