https://pub.dev/documentation/syncfusion_flutter_charts/latest/charts/BoxAndWhiskerSeries/spacing.html
spacing property - BoxAndWhiskerSeries class - charts library - Dart API
API docs for the spacing property from the BoxAndWhiskerSeries class, for the Dart programming language.
class chartsspacingpropertylibrarydart
https://www.syncfusion.com/feedback/12310/dynamic-itemssource-support-for-boxandwhiskerseries
Dynamic ItemsSource support for BoxAndWhiskerSeries in WPF | Feedback Portal
Check out the feature request in WPF - SfChart - Dynamic ItemsSource support for BoxAndWhiskerSeries.
support fordynamicitemssourcewpffeedback