Based on what you said about your system, you have both, and they can be separated.
Google "how to switch display adapters", and see what seems to best fit your system.
Easiest if you have "nVidia Control Panel" installed on your computer already (see Google for how to set it to use the nvidia for RF), but there may be a similar program installed by your PC's maker - so you may want to try their site to see if there are any "how-to" directions, before searching for generic Google answers. Just look for the term "display adaptor" (ignore ones about "display devices", or similar, those usually refer to the screens, usually using multiple ones.)