Description: On the Logical or Physical Side of the Model, the PK Designator is not showing. How do I get it to show?
Solution: Right Click on the Diagram and choose the Properties.../Entity Tab and make sure the checkbox 'Display Logical Primary Key(PK) Designator' is checked. For Table, click the Table Tab and make sure the checkbox 'Display Physical Primary Key(PK) Designator' is checked.
That will show PK Designator on the needed side of the model.
Note: These same steps may be done for the FK (Foreign Key), AK (Alternate Key) and IE (Inversion Entry) icons.