Two known issues for ER entities in ER Diagram.
How to add gradient to existing diagrams
When there are multiple Associations between the classes, you are unable to delete the name from the property view.
How to auto-create a Class/ER diagram
How to set the customized template file
How to remove the message numbers in Sequence diagram.
How to customize ER Data Type to use for ER Entity’s Attributes in Astah