How do I REMOVE a reserved static IP address in my Xfinity Router for a disconnected device

I had previously reserved a few static IP addresses for devices I no longer have. When I log into my router and look at the connected devices I can see the list of "Offline Devices" and the devices I had reserved IPs for are still listed (as expected). There doesn't seem to be any way to remove/forget or otherwise change the static assignment.

If I still had the device I could simply connect it and edit the config, but since I no longer have the device, it seems to be lost in this "Offline Devices" vortex 🙂

Does anyone know how I can remove, delete or change this IP assigment?

Any guidance is appreciated.