How to force game to use fullscreen second display
I am sure that different games approach the problem in different ways, but three things come to mind:
- Try making the desired monitor the primary monitor
- Try configuring the operating system so that it thinks the desired monitor is both the left-most and the top-most, i.e. the top-left corner of the "extended desktop" resides on the desired monitor
- You might be able to set an option using some utility which came with your graphics driver (IIRC, the AMD/ATI one is called Catalyst Control Center)