Text columns in a bar chart are, by default, formatted individually. You can create a default format by clicking any one of the values and finding one of the following options:
- In the Cell Properties tab, go to “Text properties” box, and click "Edit column default."
- In the Column Properties tab, go to “Cell defaults” box, and click "Edit text."
Both of these options will bring you to the following window, where you can select from a list of formats.