Check that the layer that the doors (walls) are in is currently visible and unlocked.
if the layer is off or locked they will still appear in the schedule, but won't be editable.
You will find the select in 2D & 3D icons at the top will also be greyed out when you select a door in the schedule.
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