Configure network access

I am trying to configure my Ubuntu (20.04) server on an old laptop, and there is something I do not understand about the configuration. From the ISP router's settings, I can see that it allocated the wifi IP 192.168.1.66 to the server, and lan IP 192.168.1.111 - I've also set the router to always give this IPs to the server and forward HTTP/S to 192.168.1.111. But being new to server-ing, I have to ask: shouldn't there be only one IP for the server?

Further more, and this is my big issue, in the Ubuntu's Network settings I cannot see the lan IP (see photo). The hosted site loads fine in the browser, and I'm also also using a software called NoMachine I connect remotely to the Ubuntu's desktop to the same lan IP 192.168.1.111, so I'm assuming everything works fine.

I just want to make sure that the server is using the lan cable to serve the site's visitors, and not connect to wifi. This is the /etc/netplan/00-installer-config.yaml

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp2s0:
      dhcp4: true
  version: 2

network photo

Update: I've just discovered the network manager command (slowly learning linux) and added an eth connection (all automatic, for compatibility). But when I try to connect to it, it still writes that the connection was never used. Nmcli con show -a displays only the wifi connection. /etc/netplan/00-installer-config.yaml is the same.

Eth connection not in use photo

OK, I've managed to find the solution myself. Hopefully it will help others. It seems that there was a bug (from what others talked about) in the previous versions of Ubuntu, and it is possible that this bug remained in 20.04. So this is my solution (in terminal):

sudo nano /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf

Add ,except:type:ethernet to the end of the line so it looks like this:

unmanaged-devices=*,except:type:wifi,except:type:wwan,except:type:ethernet

Restart NetworkManager or reboot the server:

sudo systemctl restart NetworkManager

And everything seem to be fine now, the eth connection is active. Wired Connected

PS I've also set the priority for the wired to a positive number and for the wifi to a negative number just to make sure the wired is preferred instead of the wifi.

Other also suggested to write only unmanaged-devices=none in this file. I haven't tried it, maybe it will work as well.