There are many s question around tool-tip positioning on StackOverflow ,The way I used in my chart was to show tooltip left or right on hover of column using positioner.
tooltip: {
positioner: function(labelWidth, labelHeight, point) {
var tooltipX, tooltipY;
if (point.plotX + labelWidth > this.chart.plotWidth) {
tooltipX = point.plotX + this.chart.plotLeft - labelWidth - 40;
} else {
tooltipX = point.plotX + this.chart.plotLeft + 40;
}
tooltipY = point.plotY + this.chart.plotTop - 20;
return {
x: tooltipX,
y: tooltipY
};
} }
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