Default scene disappear

Hi!

I'm here first time try to find solution. Hope to get some.

Some days ago I got interesting problem which I couldn't find on internet. problem is that - when I select component on featureManager design tree it shows component very dark shaded. If I select component face on screen it shows normally light blue. I'm already reinstall "SolidWorks 2020" but it doesn't help.

SolidworksModeling And Assemblies