Certain zencontrol input devices support device selection.
Navigate to the device list and open the filter, either by swiping from the right edge or clicking the filter icon in the title bar. Press the Search for input device button. This will move to a new page and start listening for selection events. You can now trigger a supported input device by either pressing a switch or, for zencontrol sensors, shining a light into the sensor. Note that the instance must be enabled for selection to work.
Once a device is selected, you will be returned to the device list which will be filtered to show only the device which was selected.