It is not possible to use the mini player on Ubuntu (and other Gnome) when the application dock is on the left. When the mini player appears, it automatically opens the dock and then the mini player diaper. You should open the mini player more to the right.
@leocg Thank Leo :3 This last step solved the PiP problem, it was enabled within the default settings, but it only worked when I went directly to the GPU. Thanks a lot again! Obrigada!
Congratulations to the team on their well-deserved success and award! It's the shape of that orange logo that's confusing. Here it is - very ambiguous.