Thanks again - you trying to solve the problem.
You tell me:
The question is how important it is. Given the other methods I described I don't see it as very important.
Why has both Revit and Sketchup implemented this and not Archicad?
The problem to hide a selection is the same in all 3D programs.
It is so simple to program - now Archicad shows what is selected - just let Archicad show what is not selected!!! It is so simple to program.
Sorry I cannot see the point in not programming it into Archicad.
Perhaps someone of the Archicad programmers has an answer?
Why not make an update to Archicad 16 - letting us select what to hide in the 3D window?