We don't display the data in our contents tab. You can click on a feature on the map to see it's attribute values.
There are two issues that will be fixed with an upcoming update to ArcGIS.com. The first is that the color of the polygons should be blue, as defined in the KML. Also, the popup display is quite slow, so be patient.
ArcGIS.com symbolizes the KML exactly the way it is authored. When you author your kml, if you change the color of individual polygons, that should show up.
Thanks,
Mike