The below settings will help us in changing the configured primary and secondary display.
From the home screen press Up--> Left -->9-->1-->1 on the remote control when starting from the redial list. You will be asked for Administrative login, once given go to "Miscellaneous" where you will find the primary Video output settings.
Attached is the image for reference.
Up -> Left -> 9 -> 1 -> 1 on the remote control when starting from the redial list