Select legend > Editor > Edit Legend > Attributes
After creating a graph, you can change the legend's fill and border attributes.
Fill Pattern
Automatic: Choose to accept the default fill pattern.
Custom: Choose to change the default fill pattern.
Type: Choose a fill type.
Background color: Choose a background color.
Borders and Fill Lines
Automatic: Choose to accept the default border and fill lines.
Custom: Choose to change the default border and fill lines.
Type: Choose a border line type.
Color: Choose a border and fill line color.
Size: Choose a border line thickness.