Question

I need to reduce that space, … How can I do it?

“Planificación”, “prioridad” and “gerencia” are categories, the numbers inside are series by person.

Answer 1

To do this pointPadding and pointWidth are what you want.

Try this.
The important bits are:

plotOptions: {
            series: {
                stacking: 'normal',
                pointWidth: 50,
                pointPadding: 0
            }
        },