Something is wrong with my computer(win 10) after having online lessons on zoom

[simonchor]

In the first 3 days of zoom lessons, everything is normal . But strange thing happens in the forth day: after I leave my teachers meeting, my computer's wallpaper sudden turned into a white sheet with some ink-drawing fish swimming around and all shortcuts of my files, browsers, apps, even my Recycling Bin disappeared and this happens again today.
I'm wondering why this happens, is it the problem of my zoom settings or my teacher's, or the fault of my computer?

[Bitcoin_Shaman]

Hey @simonchor Thanks for reaching out!

What you are describing are not a features of Zoom. The issue seems local to your computer. If you installed any new software recently, please look there. 

Thanks!