Home Assistant Community Add-on: UniFi Controller

Unifi device tracker - how do I remove old Entities from the list?

I get a lot of laptops added to my WIFi for a few days, and then gone. The Unifi device tracker is keeping these in a list.

When I go into the Unifi Addon and look at the Entities I have many listed as device_tracker.unifi_default_12_34_55_aa_bb_cc which I would like to delete.

I look at the entity and the DELETE option is greyed out. They are “disabled”. Enabling them does not seem to help me delete them.

Where are these listed and how can I purge them? A restart of HA does not purge them as many of these are older than my last HA restart.