identity/v3 endpoints.Endpoint struct is lacking Enabled field.
https://github.com/gophercloud/gophercloud/blob/master/openstack/identity/v3/endpoints/results.go#L41

It is returned by OpenStack API.
https://docs.openstack.org/api-ref/identity/v3/?expanded=list-endpoints-detail#service-catalog-and-endpoints

enabled | body | boolean | Indicates whether the endpoint appears in the service catalog: - false. The endpoint does not appear in the service catalog. - true. The endpoint appears in the service catalog.