Very quick and short post today.
The question:
In version 4 of Oracle SQL Developer Data Modeler, how do I get the names of foreign keys to appear on the relational model diagram?
First of all, right click in the diagram space:
Right-click in the general diagram space, not on one of the diagram objects
With this on, your diagram will now look like this:
Foreign key names align on the relationship lines, highlighted in yellow