score:1

To set the connection between nodes option series.sankey.curveFactor add a possibility to make the line straight completely or change the curve to lover.

Higher numbers makes the links in a sankey diagram or dependency wheelrender more curved. A curveFactor of 0 makes the lines straight.

  plotOptions: {
    sankey: {
      nodeWidth: 10,
      curveFactor: 0.1
    }
  },

Live demo: https://jsfiddle.net/BlackLabel/6ac2syzx/


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