Pan Cam not alerting on motion beyond 15 feet

I have sensitivity set to 75. New camera. Alerts to sound in the room but not motion beyond about 15 feet. Full screen - on. Motion detection - on. Notifications - on. Alerts arrive for motion inside 15 feet of the camera. Uninstalled / reinstalled the cam. No improvement. The cam notes my movement by ‘green boxing’ me moving through the room 20’ from the cam. Shouldn’t it alert if it’s obviously sensing motion?