The app can display all sensors that have Sensor Activity Monitoring enabled.

Sensors like smoke detectors, fire detectors, and carbon monoxide detectors put a panel into alarm regardless of the panel’s current arming state (e.g. alarm sends even if disarmed). These types of sensors are ineligible for Sensor Activity Monitoring and do not appear in the app unless the sensor is in alarm or has a trouble condition. If these types of sensors are in alarm or report a trouble condition, the sensor alarm or alert appears in the app.