These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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To show only every n'th label on the axis, set the step to n. Setting the step to 2 shows every other label.
By default, the step is calculated automatically to avoid overlap. To prevent this, set it to 1. This usually only happens on a category axis, and is often a sign that you have chosen the wrong axis type.
Read more at Axis docs => What axis should I use?