The chart legend is an independent component and you can hide it and change its position.
To hide the chart legend:
On the View tab of the ribbon, click Legend and in the legend menu deselect Show Chart Legend.
To show the chart legend:
On the View tab of the ribbon, click Legend and in the legend menu select Show Chart Legend.
To change the position of the chart legend:
On the View tab of the ribbon, click Legend and in the legend menu select the legend position you prefer.