The Sankey chart (Sankey chart) lets you add a specific type of flow chart to the sheet you are editing. The chart visually emphasizes major transfers or flows within defined system boundaries. The width of the chart arrows is shown proportionally to the flow quantity. The Sankey chart is included in the Visualization bundle.

https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Visualizations/VisualizationBundle/sankey-chart.htm