3D geometry problem

when i full in input to visual 3D the geometry but the fluka can’t. i can visualize just 2D and 1D geometry
can someone help please of how to use 3D
thank you

It’s a bit difficult to explain from remote. What one usually does is to visualize in 3D only on one viewport while keeping the other 3 viewports in 2D and work in these as it’s easier to navigate in 2D.