score:1

Accepted answer

You can change state of the selected points to select:

selectedPoints.forEach(p => {
    p.fromNode.setState('select')
});

Live demo: https://jsfiddle.net/BlackLabel/ufmxpz6L/

API Reference: https://api.highcharts.com/class-reference/Highcharts.Point#setState


Or just change their appearance, for example:

selectedPoints.forEach(p => {
    p.fromNode.graphic.css({
        fill: 'red'
    });
});

Live demo: https://jsfiddle.net/BlackLabel/0hL34rvx/

API Reference: https://api.highcharts.com/class-reference/Highcharts.SVGElement#css


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