Yes. If you’ve bought a consumer router, and not an “access point”, it will likely have a Ethernet port labeled WAN. Due to this label, the OpenWRT profile for this model will most likely also set up this port as a WAN port for you by default (where it requests DHCP from somewhere and applies NAT and some basic firewall rules). Just delete this interface, and make the LAN network also span the WAN port. Then disable DHCP and IPv6 RA on the LAN interface. Your router is now a dumb “access point”.
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