A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
The usual way to change the width of the vertical bars in a Column chart type is to change the gap width (in all versions of Excel, Windows and Mac).
Select the data series by clicking on one of the bars (just to be sure the data series is selected).
Right-click or control-click, and choose Format Data Series from the context menu.
In the Format Data Series dialog box, select Options.
Then change the Gap width.
For wider bars, make the gap width smaller.
For narrower bars, make the gap width larger.
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