Increasing link length

How to increase link size between two nodes ?

What do you mean by “link size”?

If you are talking about the thickness of the line that is the Link.path Shape, then you can set its Shape.strokeWidth to be a number larger than the default value of 1.

Sorry i was talking about link length.See image

That requires positioning the nodes farther apart from each other. That in turn might mean adjusting the parameters of the Diagram.layout, which of course depends on what kind of Layout you are using.

Diagram Layout - LayeredDigraphLayout
GroupLayout - TreeLayout