This might need to be a feature request if there isn’t a setting I’m missing. Is it possible to keep the info displayed (IP, Signal, Port, Link etc) after a device disconnects and its grayed out on the web controller? When a device disconnects from an AP, there is short time that you can still see its IP the Link it was connected to etc, but after it grays out you lose the IP, Signal, Port and Link.
If device (client) was assigned an IP address via DHCP, it is not necessary that it will get the same IP… So why would you need this info? 
Troubleshooting an issue from a device that was on the network.