Well, in theory there should be these options:
- Wifi client: connects to AP and receive IP (manually or automatically by DHCP)
- Wifi AP: bridge wifi AP and other interfaces (ethernet)
- Wifi router: creates new network using dhcp server and routing
- Wifi repeater: creates wifi AP and wifi client and bridge them together
In reality I was not able to realize some of these options throught this network editing window. Maybe it needs dhcp server running, bridging module enabled, forwarding enabled... I hoped that all of this will be done automatically through this window, but maybe not.
What I was able to do is to add manual IP address in IPv4. Thus connected devices also need to have addresses configured manually (which was possible in my phone) - gateway can be set to ip address of main computer and something like this need to be done on main computer in case of using this computer like router (sharing internet connection):
echo 1 > /proc/sys/net/ipv4/ip_forward