Adjusting Wansview camera resolution in Webcam 7 - universal source filter

I’m having trouble figuring out how to adjust the camera resolution, I’m using Webcam 7 with three Wansview 1080P K3 cameras using the Universal Source Filter. Running the cameras at 1080 ties up the CPU and video recording id choppy.
I don’t see an option in the Wansview app or Webcam 7.

More info
According to the manual the camera have two resolutions; 1080p and 480p.
In the Universal Source Filter you set different rtsp streams: /live/ch0 , /live/ch1