activeAxisLabelStyle property
Additional styles to apply to the X axis label for a point that has drilldown data. By default it is underlined and blue to invite to interaction.
In styled mode, active label styles can be set with the
.highcharts-drilldown-axis-label
class.
API Docs: https://api.highcharts.com/highcharts/drilldown.activeAxisLabelStyle
Implementation
Map<String, String>? activeAxisLabelStyle;