I've been searching for the solution to generate the simplest donut chart with Highcharts library. However, all examples of Highcharts show the style of chart with both inner pie and outer donut (refer to: http://www.highcharts.com/demo/pie-donut)
How can I get rid of the inner pie and just keep the outer donut, just like other libraries do? (something like RGraph: https://www.rgraph.net/demos/donut-3d.html)
Thank you.