[Solved]-Grouping Legends in Highcharts-Highcharts

You can't group the legends by stack, because then you'll lose the ability to identify the different components (IE either the individual series won't have a distinct color or the legend color won't match them). The legends map to the people because those are all distinct data sources and since you add them that way it displays them like that.

If you don't care about the different components having a distinct color, then you don't want a stacked bar chart at all. You can just have a normal bar chart with 2 series, male and female.

series: [{
                name: 'Male',
                data: [10, 7, 8, 9, 7]
            },
                name: 'Female',
                data: [5, 5, 10, 6, 4]
            }
        }

You can link series using ids and linkedTo. In the example below, the first serie is linked to the second:

series: [
        {
            type: 'column',
            name: '',
            data: [],
            linkedTo: 'second_serie_id',            // <--- this
            color: '#DE3733',
            pointWidth: 1,
            showInLegend: false,
        },
        {
            id: "second_serie_id",                  // <--- this
            type: 'scatter',
            name: 'FFT 1',
            data: [],
            color: '#DE3733',
            lineWidth: 0,
            showInLegend: true,
            states: { hover: { enabled: false } }
        }
        ]

I know this is an old issue, but setting showInLegend on your series, will work, and seems the easiest way.

showInLegend: false

Eg:

series: [{
 name: 'John',
 data: [5, 3, 4, 7, 2],
 stack: 'male',
 showInLegend: false
}