I have several Cam v3s. On all of them, my Detection Settings only show Motion Detection Sensitivity and Sound Detection Sensitivity slider bars, but nothing else. Isn’t the Detection Zone toggle supposed to be on this page?
Detection zone is turned off on your app. It is right below the slider for motion detection sensitivity.
Welcome Jkl. As Antonius replied, your detection zone is off. Tap on “Detection Zone Off >”, on the next screen toggle Detection Zone on, set your detection zone area, tap “Save”.