You can customize the size of doughnut hole and the doughnut by using DoughnutCoefficient property and DoughnutSize property respectively with respect to chart size.
Doughnut series supports DoughnutSize property that controls the size of the doughnut series with respect to the available size. Doughnut series takes the entire chart space when DoughnutSize is 1, it takes value from 0 to 1. By default the value of doughnutSize is 0.8
The following screenshot displays doughnut chart with doughnut size 0.7
Doughnut charts are pie charts with a hole at center, whose value is specified using DoughnutCoefficient property. It takes values from 0 to1. By default the value of DoughnutCoefficient is 0.4
The following screenshot displays doughnut chart with doughnut coefficient 0.6
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