[1803, au] Windows 10 repeatedly rearranging multiple displays

[sonofsanta]

This has been bugging us ever since we moved to Win10 but is becoming more and more prevalent as we slowly move away from VGA splitters. We often configure teacher's PCs with two monitors and a projector/touchscreen, and we do it by installing a low profile graphics card, running one monitor + the projector/screen from that GPU (set to duplicate) and the second monitor running from the onboard graphics as an extended display (set to be main).

 

When it works, it works really well. However Windows keeps being "helpful" and rearranging the screens, usually by splitting them into three extended displays (and never in a useable arrangement, of course!) which causes no end of confusion. Easily fixed, of course, but it needs us to go over and sort it as it's just that bit too complicated for teaching staff.

 

I've never spotted any rhyme nor reason to it--it might go two weeks without issue, so it's nowt to do with restarts, and it could do it in the middle of a day after being fine all morning. So: has anyone else had this and worked out why it does it, and thus how to stop it? Or, alternatively, is there a way to force screen arrangements as a startup/login script? Even if I end up with lots of specific group policies for individual rooms, it'll be worth it.