If you are working in 3D then select all (CTRL+A) and then un-select the roof you want to hide.
Or just select those elements you want to work with.
Then right mouse click and 'Show selection in 3D'.
This will effectively hide what is not selected.
Or in 2D select just the elements you want to work with and then view in 3D.
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