Have ArcGIS Server Enterprise 10.6.1 instance with a FeatureService with a single point layer. If I go to http://<myarcgisserverurl>/<myservice>/FeatureServer/0/query I do not see PBF as a format in the drop-down.Nor can I jigger the URL querystring with f=PBF (Format not supported). Is there something I need to do to enable the PBF format? Can't seem to find documentation on this -- I know it was previously only in ArcGIS Online but thought it was a 10.6.1 capability.