Thanks for contacting us here about this extension.
If there are many participants, is it possible to use the scale and collapse the branches of the chart tree ?
Sorry for the late response. I'm not sure how many members in your chart; however, you can enable Zoom feature in a chart. So you can display the large charts by using Zoom in/out on frontend. The basic chart would perform well with 5 to 6 items a line, btw.