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I am not associated with Laminar Research or XforcePC in the USA. Just a flight simmer like yourself living "downunder".
Have a look at the following from Michael Brown who is recommended by Laminar Research as the PC supplier in the USA for anything X-Plane. He is quite conversant with X_plane at https://www.youtube.com/watch?v=3YC2XhAk9p4
What he is actually showing or demonstrating is a package XForcePC is selling but what the principle is being demonstrated is what you most likely are seeking.
On the proviso you are running windows, initially set the two screens up as two units and try the effect but I am of the opinion that he has stitched the two screens together as a single unit. Try as an alternative.
Michael has a lot of other good informative videos as well which can be found at https://www.youtube.com/user/col2mab/videos?sort=dd&view=0&shelf_id=0
Hope this helps
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