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The 'Activation width' property determines how wide Trace Modeler will draw the message activations.
There are three possible values : Small, Medium and Large.
It is one of the diagram style properties, the examples below demonstrate its effect on a diagram.
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For a visually pleasing diagram, whenever you change the 'Activation width' property you should consider adjusting the 'Message spacing' property as well. The interplay of these two properties has a great effect on how a diagram looks.
To change the 'Activation width' for a style