Not all relationship are displayed?

The 'Show Literals as nodes' feature is cool. I am looking at this music example:

Where I can see in the graph no full IRI is shown, only class name, like 'Song'. But when I load the data and display it, on the graph the full IRI is displayed, which is crowded. How to avoid displaying the full IRI as done in that post? Seems like I didn't find a setting to control that but curious how it's achieved in the tutorial.

Please see the graph export.