Change Main Display on Login Screen

Hi,

Currently I notice that Mac Mini (M2 Pro) keep changing Main Display randomly when I turned on Secondary Monitor. Sometimes it displayed correctly but sometimes not, when it is not I can't Login because the Secondary Monitor is facing Stage (Not Operator) on my Church.

How can I create a Shortcut to Switch the Main Display on Login Screen? I already use DisplayPlacer but that doesn't work on Login Screen and also SSH:

Normally when a User Logged On Display Placer will show 2 Screens with Possible Resolution but there is no screen defined above.

Please be kindly advise.

Thanks in advance.

Best Regards,

Henoch