To set an Event chart's overflow percentage

  1. If you have not already done so, insert a chart by selecting it from the Insert menu, or double-click an existing chart to access the chart's configuration panel.

  2. Select the Chart tab.

  3. In the Overflow Percent box, enter the percentage amount.

  4. To change the background color for the overflow, click the Background button. Select a new color from the Background dialog box and click OK.