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The 'Return alignment' property determines where Trace Modeler places the label on a message return arrow.
There are three possible values : Sender, Center and Receiver.
It is one of the diagram style properties, the examples below demonstrate its effect on a diagram.
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Note that this is not a matter of left/center/right alignment, it all depends on the relative positions of the sender and the receiver, as well as on the value of the 'Layout direction' style property.
For a visually pleasing diagram, consider using one of the popular combinations for call and return alignment.
To change the 'Return alignment' for a style