How to Control HTML5 Pie Chart size

Issue Description

Inside my report I have 3 Pie charts on the same line with the same width/height.  The problem is about the height of the pie chart because it changes according the number of category it's showing: fewer are the categories and bigger will be the chart.  I would like to get all the three Pie Charts with the same height and aligned vertically.

Resolution

The default behavior is to scale pie chart to the plot area and give room for data labels within the plot area.  As a consequence, the size of the pie may vary when points are updated and data labels more around.  To avoid the behavior you should specify plotOptions.pie.size property for each pie chart:

https://api.highcharts.com/highcharts/plotOptions.pie.size

It can be a percent value, for example 80%

Ref. Case 01558092