To use the night vision capability of your camera, you don’t have to modify any settings.
Night vision will automatically be switched on when it gets dark, and switched off when there is sufficient light again.
Note ! : When you experience problems with the picture quality in the dark, then you probably have pointed the camera on a white wall/ceiling (reflective surface). Make sure that you point the camera in a different direction and make sure that the camera is more than 30 to 40 cm removed from the wall/ceiling.