Change the Pattern and the Width of Lines in Graphs
You can specify the line pattern and the line width in graphs such as line, area, combo, overlay, radar, reference, trend, or forecast graphs.
You might want to change the appearance of lines in a graph to make
            them easier to view. For example, you might use a dotted line for Sales to indicate that
            the Sales line is an estimate.
               - On your home page, hover over a workbook, click Actions, then select Open.
- Click Edit.
- Select the graph that uses lines.
- Click Properties.
- If you want to change the default line pattern and width settings for all lines
                    in this graph, select General and then expand
                        Line.- To change the line pattern from Solid, click Solid and select Dashed or Dotted.
- To change the line width, click the Width field,
                        select a value, or click Custom and enter a number
                        for the line width in pixels. For example, enter
                        2.5px.
 
- If you want to change the line pattern and width to override the default value
                    for a selected measure, select Value, and then expand the
                    measure. For example, expand Sales.- To change the value of Line Pattern, click the current value, click Auto, and then select Solid, Dashed, or Dotted.
- To change the value of Line Width,
                        click the current value and select a value, or click
                            Custom and enter a number in pixels. For example,
                        enter 2.5px.
 
- Click Save.