Can't change iface variable for the Firewall panel to other than igb0

[cwm77]

I think the dashboard is really great, but unfortunately, I can't find the right magic with which it would be possible to set an interface other than igb0 for the firewall panel. The relevant OPNsense firewall runs as a VM and has only vtnet instead of igb interfaces.

Perhaps the documentation here is also somewhat inaccurate? It says:
"iface - $iface is the interface variable for the Firewall panels, I have it set to igb0 by default. You can either remove igb0 so you can select all interfaces, or use a comma separated list of interfaces."

Unfortunately, there is no setting in the relevant variable at all that refers to the mentioned default setting igb0.

[superczar]

The variables are defined under dashboard > dashboard settings (located at the top right next to the time-period selection dropdown) > Variables
You can change the variable type from existing query to a custom list and add your own list as needed