On the device menu of FaceStation 2, you can configure how far the device will scan a user.
If you don't want the device to attempt to scan people that are passing by the hallway, you may want to set the motion sensor to a value that is lower.
The visual camera scans the near object based on the change in the video feed and hence there isn't a exact angle or exact distance we can pin this value to,
but an approximate value would be as follows:
Low : within 1.0m
Medium : 1~1.5m
High : 1.5m