This is very simple.
All network configs are linked here:
/hive-config/network/20-ethernet.network
/hive-config/network/30-wireless.network
They are visible from Windows so you can edit them before you boot.
Sample config for static IP is like this:
[Network]
DHCP=no
Address=192.168.0.189/24
Gateway=192.168.0.1
DNS=192.168.0.1
In rare cases different MTU is required. Default is 1500. To change it add the following:
[Link]
MTUBytes=1400
