Column width in a clustered column chart

How do I change the width of a column in a clustered column chart?

I don't think you can do this for a single column. To change the width of all columns, right click and select "format data series" then adjust the gap width.

If you need to have one column wider than others, you could do a workaround by adding a dummy series adjacent to your existing series with the same colour. Then put identical values against those points where you want a wider column. This should appear as a single wider column, though in fact it will be two adjacent columns.

Thank you very much! I will try to do what you suggested.