Light Zones

New here. I understand the light motion sensor is comprised of three 90 degree zones. I’m using the center zone only because I have a yard flag about 13 feet from the sensor. Can anyone define how the min-max setting effects distance from the sensor? The center zone has a 90 degree field of View on the horizontal. What is the vertical axis field of view? I’m trying to keep the light from going on and off constantly.