Nighthawk RAX80 - Attached Devices list (not updating/refreshing)

Hello,

Current FW: V1.0.3.88_1.0.41

I realize this topic may have been addressed on other models but I haven't found a direct answer towards the issue reported originally by others which is the Attached Devices list not displaying the correct devices currently active, I've been searching all over to clear the IP that no longer is in use but have not found a way to do so.

Essentially, the "attached devices list" will populate showing the devices that is allowed in the network but once they are no longer present those IP addresses should be released, is there a lease management section that the router controls automatically ? 

Would appreciate any recommendations or workarounds if any..

Thank you