score:1

Accepted answer

I prepared a demo which shows how to keep tooltip shown for the last point.

Demo: https://jsfiddle.net/BlackLabel/vL7k1yce/

  render() {
    let chart = this,
      points = chart.series[0].points;
    chart.tooltip.refresh(points[points.length - 1]);
  }

Is that what you wanted to achieve?

API: https://api.highcharts.com/highcharts/chart.events.render

API: https://api.highcharts.com/class-reference/Highcharts.Series#addPoint


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