Hi Mike! Nice to see you over here 
LibreRouterOs and luci do not play well together. You can restore the default configuration by running firstboot command in the LibreRouter, or by following this guide to do it by pressing the reset button: How to reset the LibreRouter configuration
There is no current way to checkout connected devices using the LimeApp. We may add it soon, it would be awesome!
By now, you can check it out by running these commands:
iw wlan0-apname station dump which will print statistics for each device connected to the AP with the ssid following this template: <community_name>/<node_name>
iw wlan0-ap station dump which will print statistics for each device connected to the AP with the ssid equal to the <community_name>
cat /tmp/dhcp.leases which will print all devices that received an ip address given by your LR, their mac addresses IPs and hostnames.
If you want to run this commands from the LimeApp, in LROS 1.4 you can open a terminal session from “Menu -> SoporteRemoto” and then create a session and show the web console.
I hope this will help you!