FWA710 LAN settings

I want a LAN address pace different from the default 192.168.1.1 - I want 10.0.0.1 / 24 for compatibility with my existing LAN. There are two conflicting places in the 'Web-based Configurator" to do it: a) on the home screen LAN section and b) on the Network Setting - Home Networking section. If I 1) Factory Reset, 2) use the Home Networking to setup the LAN details, then the setting on the home screen reflects it, but if I click the right-arrow, then is says that the network is now 192.168.2.1 (note the '2'). And my attached devices now get DHCP addresses from 192.168.2.x, not from 10.0.0.x. Now, if I try to change that setting back to 10.0.0.1, then I get a popup saying there is an address conflict.

Even more curious is that I can now sign in to the router Web by either one of the two addresses 10.0.0.1 and 192.168.2.1. It seem like the 10.0.0.x space is now a DMZ of some kind - it should not be accessible on the LAN space.