tooltipDisplayMode property

Display mode of tooltip.

By default, tooltip of all the series under the current point index value will be shown.

Defaults to TrackballDisplayMode.floatAllPoints.

Also refer TrackballDisplayMode.

late TrackballBehavior trackballBehavior;

void initState() {
  trackballBehavior = TrackballBehavior(
    enable: true,
    tooltipDisplayMode: TrackballDisplayMode.groupAllPoints
  );
  super.initState();
}

Widget build(BuildContext context) {
  return SfCartesianChart(
    trackballBehavior: trackballBehavior
  );
}