To show the Palette Bar, click the Tools button and choose Palette Bar from the Tools menu. Drag the color from the Palette Bar to the portion of the graph you want to change. You can change the color of any part of the graph you’re viewing, including the graph and legend backgrounds. Use the arrows at the left of the Palette Bar to scroll through the available colors You can double-click a color on the Palette Bar to open the Color window, where you can define custom color.