Not to worry, your motion zone is still likely covering the entire area of detection field of view. Especially if you are using a battery-powered Ring device. As mentioned in our Community article below, “Motion zones can not be extended to the full area of your Live View when creating these zones. This is because the area your camera covers is slightly larger than the area your motion sensors cover.”
As mentioned in our Community article below, “Motion zones can not be extended to the full area of your Live View when creating these zones. This is because the area your camera covers is slightly larger than the area your motion sensors cover.”