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From what I have read of your recent questions with respect to multiple monitors you may "drool" a little on what you see from X-ForcePC (Michael Brown) at the following link https://www.youtube.com/watch?v=AiaTJOZ33nY
Have fun in watching.
In X-Plane 10 I believe it used to be which ever monitor was on the right was considered the primary monitor. In X-Play 11 we may look at the configuration in the operating system? It appears on my 2 monitor iMac set up, X-Plane matches the OS monitor arrangement.
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