score:1

Accepted answer

You need to decrease enabledThreshold property:

series: [{
    marker: {
        enabledThreshold: 0
    },
    ...
}]

Live demo: http://jsfiddle.net/BlackLabel/knzg84Lj/

API Reference: https://api.highcharts.com/highcharts/series.line.marker.enabledThreshold


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