isVisible property
Toggles the visibility of the marker.
Defaults to false.
Widget build(BuildContext context) {
  return SfCartesianChart(
    series: <SplineSeries<SalesData, num>>[
      SplineSeries<SalesData, num>(
        markerSettings: MarkerSettings(isVisible: true),
      ),
    ],
  );
}
Implementation
final bool isVisible;