You may have walls and columns turned off in your "Filter & Cut Elements in 3D" settings.
CTRL+ALT+A is the default shortcut (Windows at least).
If that is not it then I would look at what renovation filter you have applied.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11