Azure OPNsense Appliance Cannot Select WAN Interface

[contrary warrior]

Hi,
I'm new to OPNsense and somewhat new to Azure.  I just created an OPNsense appliance Azure, and was a little surprised that the Internet-facing interface automatically created is LAN.  I'm trying to get my NAT gateway rules set up so I can route some GRE tunnels, but I think that needs to be done with a WAN interface?

Most documentation I look at assumes the Internet-facing interface is WAN, but none explain how to change a LAN int to a WAN type.

Any help would be appreciated.