1.If the diagram is in a document or a worksheet, double-click on the diagram to open it.
2.Double-click on any column or bar in the curve.
2D Diagram:
3.In the Column width field, choose either Fixed and specify the value in percentage of distance from the neighboring columns, or choose Dynamic to set the columns seamlessly side-by-side for a different X interval.
3D Diagram:
3.Switch to the Display tab and choose either Column with width of and specify the width, or choose Spike graphic.