As mentioned in the other post I linked to, have you set the vertical limit on in the section/elevation but have the heights set to zero (or the same) for upper and lower limit?
This will result in you being able to see the elements, but not select them by their perimeter.
You can still select them by their fill (Quick Select - magnet).
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10