The sensitivity of night vision is actually the sensitivity of the ambient light sensor. The ambient light sensor senses the brightness of the light available around your camera. When it senses that the light is darker than the threshold, the camera will enter the night vision mode. By adjusting the sensitivity, you can control how easily the camera enters the night vision mode. The higher the sensitivity, the easier the camera enters the night vision mode.
To adjust the sensitivity, please tap the camera "setting" icon > tap "Lighting Setting" > tap "Light Sensitivity Level".