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Add a VLAN (a tagged network on one of the interfaces); it is then offered below.
Optional. The router answers for it, publishes DHCP reservations in it, and clients get it as their search domain, so nas finds nas.home.example.org.
nas
nas.home.example.org
PPPoE only:
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Fill in the last row to add a LAN. Other LAN settings (zones, a fixed IPv6 address) are kept; edit them under Advanced.