Fullscreen resolution change – Ubuntu sidebar problem

Hi

Since Kodibuntu is discontinued I decided to use std Ubuntu and just autostart Kodi.

However I am running into an issue that whenever I change the resolution within Kodi (fullscreen) from high to low (i.e. 4k -> 1080p) I see the Ubuntu side and top bar.

Can this be avoided somehow? I am sure I am not the inly one using std ubuntu…