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:

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