Hello,
Has this started to appear with Windows 10 v1903 our were you able to observe the issue before?
How many graphics card do you have in your computer?
I think it probably matters when you launch the application rather than before you reboot.
Once the application is started, I expect you to be able to change the primary display fine until you restart the application as I believe the issue could be listing the displays.
Kind regards,
Alban
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