How to choose the editor render settings

Im quite new to the UE4 and making my first steps.
I was shocked about the horrible performance in the editor until i realized that it is running on the Intel HD Graphics Chip of my Core i5 instead to use the power from the NVIDIA GT750M. I tried around and clicked through many menus but could not find anything to choose the Graphics card.

It sounds strange that it goes using the integrated chip instead of the dedicated card.
Are you sure the OS is detecting and currently using the NVIDIA?

This is usually achieved by setting the default graphics processor, either through the nvidia control panel or by right-clicking the executable and choosing what to run with or make default.