Apologies, I found the solution.
- Settings Display, and change settings to the max Pixel size available for your screen. In my case 1920 x 1200.

Hi, I am a newby to OpenModelica, though eperienced in modelling.

Using Fedora 31 I downloaded openmodelica-1.15.0~dev-45-g634bc00 and use it in Gnome Boxes. Works nicely,

I am not sure if it is a Gnome Boxes or Open Modelica VM built issue: I cannot setup the VM and/or OPenModelica to use/to adapt to the entire display....

Any idea/toubleshooting most welcome.

Best regards,

Peter