If you have already placed the door then just use the mirror command and use the centre of the door (along the wall length) as the mirror point.
Unlike normal mirroring where you need to define 2 points as your mirror plane you only need one with doors and windows as they must mirror in the wall.
This will change the handing.
If you are placing a door then you choose the hand by the position of the cursor on the last click.
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