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I've not tried actually, I've always had my screen set at 'Dual View' which is essentially 2 separate screens (one you set as primary monitor and games and full screen apps run on that, other apps can be moved across easily)
There's another option called 'Span' which essentially turns both screens into one big one, I may try that.
(Then there's single screen, where one screen just isn't used, clone which is same thing on both screens)
Are those monitors displaying two halves of one picture?