Active DHCPv6 Leases (LuCI) and not only

To the added IPV4 address, I also added IPV6 and my device was no longer visible on the SAMBA V2 network. If I can edit and delete in IPV4 settings, then in IPV6 settings this is not possible.
How to use this functionality? Or is this impossible?

In which file can this be removed during direct editing? This is not possible in Luci...