I am using fp2-sibon-17.11.2 release.
I remember there used to be some advanced options to manually set the DNS server in case there’s a problem with the WiFi network, and even a static IP address in case the WiFi doesn’t do DHCP (properly).
Now the “Modify network” window of the selected WiFi network entry has, under its “Advanced options” dropdown, just the option of selecting a proxy configuration… but even there I can’t seem to specify the proxy address or anything.
There is also an “Advanced” menu entry in the WiFi settings which allow to set other things like frequency band, certificates, Wi-Fi direct, WPS settings etc, but no settings for IP address, DNS server or proxy.