How can I resolve this? It's a bug?

[Draxed]

Hi everyone!
I'm writing this post because I want to resolve this problem.
As you can see in this screenshot, in the window there is an trasparency effect.
How can I delete this and set an default background?

Schermata-2020-01-08-alle-21-52-10.jpg


Kali Linux 2019.4 (2019-12-09) installed on Parallels VM, MacBook Pro 16"

[Robertde12e]

Kali does some funny stuff most of which you will spend more time trying to fix than using kali do yourself a favor back it up and reinstall something is broken or didnt install correctly.