Nvidia gtx 1650 2nd monitor displaying black light

Hello, I'm trying to use a dual boot config with windows 10 and ubuntu mate 20.04. My station uses an amd ryzen 7 3750H processor and 2 GPUS: integrated gpu amd and dedicated nvidia stated above. I installed the recommended driver for the nvidia, however it seems that the rendering gpu used by the system is the amd one. The system recognizes the second monitor and I can put windows on it but I just cannor see them since all I can see on my second monitor is a black light. Any thoughts on this would be really appreciated. TIA.