[Solved]-Highcharts Gantt - how to force data labels to always be above milestones?-Highcharts

You can position data labels above the markers by using y property:

  series: [{
      ...,
      milestone: true,
      dataLabels: {
        ...,
        y: -10
      }
    }, ...]

Live demo: https://jsfiddle.net/BlackLabel/yv641op0/

API Reference: https://api.highcharts.com/gantt/series.gantt.dataLabels.y