When I updated to VS2019 16.11, I used XUnit for unit testing. After the test was completed, I closed the test window. Then a serious bug occurred in the whole VS2019, and other software Windows could not be switched. When I mouse over other Windows on the taskbar and try to display them, they don't show. When I open a new piece of software, the software can be opened, but it cannot be displayed on the top level. When I minimized VS2019, things got better, and then everything was fine. After opening VS2019 again, the same thing happened again.

