Answer №1

explore tooltip formatters and customize them as needed

tooltip: {
  useHTML: true,
  formatter: function() {
    return '<small>' +
      Highcharts.dateFormat('%A,%b %d,%Y',
        new Date(this.x)) + '</small><br> '+
                "<span style='color:" + this.points[0].series.color +
                "'>\u25CF</span> " + this.points[0].series.name + ': <b> ' + this.y + '</b>';
  }
},

Interactive demo on Fiddle

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