The web interface was missing the interface name, but that was just a cosmetic issue.
This issue was already fixed in the development branch (merged one hour ago).
What interface gets committed to the configuration when switching to one of the interface specific options?
The settings on the image above never change the interface. This options change only the dns.listeningMode:
To change the interface, you need to use the "All settings" page and change dns.interface:
