I've had a problem with virtualBox for a long time.
I have a Windows 10 installed for a long time and I don't have any problems. The virtual machine displays well in full screen.
It is only with "Linux" virtual machines that I have a problem. It is impossible for me to display them in full screen. Because of this, I can't even install some of them.
Yet in "Settings", "Extensions", I have "Oracle VM VirtualBox Extension Pack" installed.
If I do "Swap Screen", nothing changes.
Can you help me?