Running a QHD external monitor

[Trip01]

I have a Gigabit laptop with a GTX 907M graphics card running windows 10. The max resolution of the laptop monitor is 1080. I have an external monitor capable of 1440p and I'd like to run games it at that resolution.

I can't work out how to do this. I can get the desktop to run both monitors with the external monitor in 1440p (using the on board intel graphics) but when I start a game (using the Nvidia card) it runs on the laptop monitor.

I'm sure this is really simple. I'm not an expert.

 

[Trip01]

I'm not worried about framerate, this is a golf game and it's not very taxing. I just want the higher resolution.

Can you explain how to use the nvidia control panel to choose the output device? I can't work it out.