How to select on which monitor to display the game ?

So it seems I can add a variable inside <project>/Config/DefaultEngine.ini:

[ConsoleVariables]
Slate.Transform.FullscreenMouseInput=False

This fixes the problem!

But also, this variable is true by default, and given this description:
"Set true to transform mouse input to account for viewport stretching at fullscreen resolutions not natively supported by the monitor."

So it may be a non-solution. But whatever the case, I still think this is an engine bug. At least the text description should be changed to "[...] not natively supported by the primary monitor."

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