Doorbell 2 help

I have a Ring Doorbell 2 (battery operated) and I can not seem to get the correct zone setup the way I like it. It has the 2 circles (dark blue for people, light blue for cars). If I bring back the light blue it also brings back the dark blue and it doesn’t pick up until someone is at my door. We want to pick them up entering my gate. If I entend the circles then it picks up every car coming down my street. How come Ring doesn’t allow you to move just the dark circle out further to pick up people farther out? Seems like that would be a great option. I did select the new “people only” feature but it still picking up and recording every car. I also did put a wedge to angle it lore down but didn’t help. Thanks for any help