Intel's graphics is used instead of NVIDIA GeForce by default (for both DirectX and OpenGL). For DirectX I see way to change it in menu, but I can't set screen dimensions (It works if I set them by ogre.cfg file). In OpenGL I don't even see a option in menu to choose different graphic card.
Yeah this is a known issue. The monitor outputs are incorrectly bound to devices in our code.
Btw unrelated of our bug, this happens because the monitor is plugged to the Intel card instead of being directly attached to the NVIDIA card. This is inefficient.
This is also why the Intel card is the default one (it's physically the primary one).
Unless this is an Optimus laptop or the NV card has no outputs, or you're doing this on purpose for some other reason, you'll get better performance by changing your physical connections so that the monitor is directly plugged to the NV card