In Cisco CMX, to view active RFID tags, the engineer needs to enable the tracking of these tags within the system settings. This is typically done by selecting an option that allows for RFID tag tracking, which makes them visible on location-based services like the Detect and Locate window of Cisco CMX. By enabling this feature, the system starts to interpret signals from RFID tags and displays their location accordingly. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide