I try but still the same problem.
In 2d i see level by level but in 3d the problem keeps, I gave the floor a structuur but it din't help
BTW i make a mistake

i sayed floor, but mean room (levels)
i have 3 rooms (3 tabs) (3 levels)
first room = basement = first level
second room = first room = second level
third room = second floor = third level
In 3D view in options, i can choose to show all levels of my house = no problem
But when i select show only selected room in 3D then the 3D show me the selected AND the underlying levels also
i mean when i selected the basement in the 2D:
i see only the base in 3D.
When i select the first floor in 2D :
i see the basement AND the first floor in 3D.
When i select the second floor in 2D:
i see basement AND first level AND second level in 3D.
Is there a system to see ONLY the selected room in 2D
so when i select the second room i see ONLY the second room in 3D.
The solution that i have for the moment is to save al the floors in different file's.