I've got an NX200 5G router. I couldn't figure out how the LAN3/WAN port would work as an LAN port. The other two LAN ports work well.

I didn't change something at the preset settings on port forwarding / DHCP / DNS / ...

Is there a setting somewhere to change the WAN port to be the LAN3 port?

Tried already to restart it. When I connect the same device with the same cable to the LAN1 or LAN2 port it does work.

Thanks