Problem with visual window

[LazarosTsiairis123]

Hello everyone!!!
I tried to install geant4-v11.2.1 in my Ubuntu 22.04 version but when I run every example it shows the window of visuals but not the geometry as you can see in the screenshot. I don’t know how to describe the issue so if you can help me solve it.

Thank you for your time.

[LazarosTsiairis123]

In full scale of the visual window to help you understand better the issue. In the blank area it always show me the background (Terminal, Desktop etc.)

[John_McFee]

Hi,
Are you running Wayland or X11? There is a problem if you have compiled Geant4 to use X11 (-DGEANT4_USE_OPENGL_X11=ON) and Qt (-DGEANT4_USE_QT=ON), but your login session is running Wayland. If this is the problem, the simplest solution is to use a login session with X11.

[LazarosTsiairis123]

Thanks for your time and effort sir, you fixed my issue.