Hi All,

Please see the screenshot below,

I insert an association line between Student class and Classroom class, I want to change the line style. Such as begin arrow type or dash line. I set them via Format Shape TaskPane. But no working. Why? If my operation is incorrect, How to format the line.

T

You can change association (connector) type using right click -> Set Connector Type.

The connectors provided with UML stencil are locked to types which make sense for the UML class diagram. I don't think that you should remove this lock - it's done like that on purpose.