How to: Change the pattern of an arrow in a chart.
Solution:
Select the chart and click on the arrow. Select the 'Format' menu and select 'Object...'. Click 'Pattern'.
1) Double-click on the desired chart. (A striped border with handles appears around the chart.)
NOTE: If the chart is on a separate chart sheet in Excel, click the tab for the chart sheet.
2) Click once on the desired arrow.
3) Select the 'Format' menu and select 'Object...'. (The Format Object dialog box appears.)
4) Click 'Pattern'.
Pattern button
5) Select the appropriate style, color, and weight for the arrow line in the 'Line' group.
6) Select the appropriate style, width, and length for the arrow head in the 'Arrowhead' group.
NOTE: To view the available choices for each item, click the Down Arrow button next to the item.
Down Arrow button
7) Click 'OK'.