I fixed the problem, but it wasn't related to the height and elevation. The problem was that I surrounded the project with rooms al level -0 when i deleted one side the 3D appeared correctly.

Hello, thanks for the replay but i arleady have "display selecter level" and it dosen't work.
I see all the level "covered" in the 3d. Maybe could be linked to the fact I see item placed in the -1 visibile in -0,5?

Hello,
i created a 2 level with negative elevantion.
- Level -1: H240, Elevation -240
- Level -0.5 h240 elevation -120
- Level 0 H250 Elevation 0
Wen I select the level -1 I cannot see in 3D the rooms because it seems there are ceiling/floor that hide the view.
How can I correct that?
This problem ...