If desired, you can show a legend in the chart. For more information, see Showing/hiding the legend.
A legend is a small box that shows which data series are displayed in which color/pattern.
Edit properties: To change the properties of the legend, select it, right-click it to open the context menu and choose the command Legend: Properties.
Tip: Alternatively, you can choose this command via the Edit properties icon 
on the ribbon tab Chart | group Chart elements. The other alternative is to double-click on the legend.
Note: If you only want to edit a single legend entry (you can also apply a formatting to it that differs from that of the legend as a whole), then click again in the area of the desired legend entry after selecting the legend. You can now choose the command Legend entry: Properties via the context menu.
You can make the following settings:
Format tab
Tip: Borders and fill can also be conveniently adjusted directly via the buttons of the ribbon tab Chart | group Chart elements. For more information, see Editing chart elements.
▪Border section
| Here, you can change the line style of the legend's border. To do so, use the option Custom to select the desired line style. The option None removes the border. |
| If you enable the option Shadow, the legend will also be highlighted with a shadow. |
▪Fill section
| Here, you can change the fill of the legend. To do so, use the option Color to select the desired fill color. The fill will be transparent if you use the option None. |
| If you select the fill type Effects and click on the Customize button, the program will display a dialog box that will allow you to also apply more complex fills (such as a color gradient). The use of this dialog box is described in Object properties, Fill tab. |
Font tab
You can use this tab to change the character format (font, font size, text styles, etc.) of the legend.
Legend tab
Here, you can specify where the legend should be displayed.
If you select the option Custom, the legend can be moved to any position (using the mouse).
If you select None, the legend will be hidden.