Spotlight cam light remain on

I've installed a Spotlight cam mount in the back pation. It is nice and I loving it. But when we are out at the patio at night with friends and family, we need the lights on and remains on. The maximum duration for the lights is up to 15 minute, then we have to trigger the motion detector to turn the lights back on by our body movement. Sometime our movement is small that is not enough to trigger the motion detector. Why can’t the lights turn on and stay on until we turn it off?Thank you.