Hi Bernard,
That's correct -- we don't display data properties in the graph so as not to clutter the graph (and because we've heard feedback expressing a desire not to show the data properties there). You can see data properties and their targets for any given node by clicking on the node itself and looking at the bottom bar of the visualization, as shown in the image below (where I've clicked on the ":Empire" node; you can see :name "The Empire Strikes Back", etc.):
Does that help? Do you still have a need to see all of the data properties and their targets inside of the graph visualization itself?
Thanks,
Jason