Black stripe over the desktop above

I can not explain how stupid is this for me but just can’t solve this problem.My desktop is slipped down and I have above a black stripe,under the icons are half visible!
I have tried in terminal to reset but did not succeeded.

dconf reset -f /org/gnome/

I use an old Mac 2008 and works great with the Bungie 20.04

Hi and welcome - can you please take a picture so that we can see what you are seeing?