Disabling UPnp on NH20T hub

My home setup does not include the need for gaming or other activities requiring UPnp to be active. Leaving UPnp open creates a security risk because the protocol requires no authentication.

There is no obvious UPnp toggle available when logged in as admin to the NAT interface.

Since I'm trying to be proactive in securing my network against external threats, I'd like some guidance on how to disable UPnp which is likely set to active by default.