Why is the point of customizing the area when you have a motion zone set?

What is the point of the setting where you set a range for Min - Max for the motion zone? I created a motion zone, that's the area. Why is there another, different setting to st some kind of Min - Max range? Makes absolutely no sense. Or at least, it's not explained properly.The setting here:Device Settings \> Light Settings \> Motion Zones for LightsWhat is the circle with the range setting? My custom zone is not a circle. Totally baffling.Image attached. Thanks for specific help.