Accepted answer

It looks that the rotation feature is not supported if grid is enabled for an axis. You can disable grid (example: or write a piece of code to operate directly on svg elements:

    chart: {
        events: {
            render: function() {
                const ticks = this.xAxis[0].ticks;

                for (let tickPos in ticks) {
                        rotate: -90,
                        translateX: 10

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