What you're doing is testing it to see what motion it would catch at that setting... to actually change the setting, open up Arlo on your phone, select mode, then select the pencil next to "armed", then select the pencil next to whichever camera you want to change, then select the pencil next to "detects motion", and then set it at whatever you want. And remember to save. You have to do this for each camera individually. Some of mine I couldn't set at 100 outside or they would pick up wind, rain, etc. Hopefully that helps!