This is a little refresh in how to set up the Legend in a Chart; I hope you find this helpful.
From the design view, right click the Legend and select Legend Properties.
In the Legend Properties dialog box, in the Legend Position diagram, you can click on yourdesired position option button, and then, in the Layout drop-down list, you canexperiment with several selections: Column, Row, Auto Table, Wide Table and Tall Table.
By default, the legend displays in a table andexpands horizontally or vertically according to the chart space available. Youcan force the legend to expand vertically by choosing Tall Table or to expandhorizontally by choosing Wide Table. You can also require the legend to displayas a single column or row by choosing Column or Row respectively.
Notice the other pages available in the Legend Properties dialog box to set properties forlegend visibility, font appearance, the color and style of fill, border, andshadow effects.