I have updated to the latest version of visual studio Community Edition（2019 v16.7.6）.
But WPF design interface display is not normal. The form background has a black square, and the properties window becomes black. Changing the visual studio theme can temporarily solve the problem, but once the software is restarted, this will happen again.
I tried to re install windows and visual studio, but I couldn't fix the problem. Later it was found that the problem was the driver of AMD graphics card. When I unloaded the graphics driver, the XAML design interface displayed normally. I will have problems installing any version or the latest version of the graphics driver.