How to stop Windows from switching to secondary display when turned on

Try3 · 10 Jun 2022

TidySean said:

... I don't want it to remember the arrangement of windows after unplugging a monitor.

Then just change display to PC-only before removing the external monitor and Windows will remember everything being on the main display instead.
WinKey-P
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Create a Display Switch shortcut - TenForumsTutorials
I use this method almost every day.

All the best,
Denis

filoppi · 19 Jun 2022

Ghot said:

It actually didn't work. It was a false positive. It's back on the old behaviour of switching to HDMI whenever its turned on, independently of which (of the 3) DisplayPort was in use.
Seems like HDMI just has a higher priority, and it's unexplanable.

filoppi · 25 Jun 2022

I actually realized what was the reason for this.
I usually just plug off my TV and computer at the same time, so I never manually set the PC back to use the monitor as main display, but it would work anyway as when I turned the PC on again, the TV was off and the monitor was on, so I never realized the issue.
Internally, Windows still knew that the TV was supposed to be the main display whenever it would be turned on, so it would switch to it automatically, independently of the video card output priority.