On mine, whenever I unplug the monitor cable from the laptop, it automatically reverts to a non-external monitor mode.
When I re-attach, I have to go through the right-click Graphics option.
However, if the VGA is connected when I start Windows, it finds the external monitor automatically.
OH - ok - so good to know! I can’t remember if I have disconnected the monitor cable from the docking station or not. Don’t think so.
But I have of course undocked the laptop - and, come to think of it, that may be when this problem started - after I put it back in the docking station after having it on a trip with me.