Arrange Shapes in the Attribute Relationship Diagram
You can change the layout of the shapes on the Attribute Relationships tab of the Dimension Structure view in Dimension Designer in SQL Server Data Tools (SSDT).
To arrange shapes in the attribute relationship diagram
In Dimension Designer, open the dimension that contains the attributes that you want to create an attribute relationship between.
On the Attribute Relationships tab, in the diagram, click a shape to select it, and then grab the shape by the top edge and drag it to the new location.
You can also click Arrange Shapes to automatically arrange all shapes according to the layout algorithm that Dimension Designer uses.