Horizontal Legend in chart

    This document helps to move the Chart Legend from top to bottom of the chart.  Please follow the below steps

    Chart Properties -> General -> Click on Resize User Sizing and Resize User Docking buttons.
    Click on the chart header or somewhere in the chart
    Hold Ctrl  + Shift buttons together
    Now the legend is highlighted in Red border
    Now drag the legend portion to the bottom of the chart and drop when you see the Red Rectangle in the chart
    
    

     

    Also you can watch this video in Youtube using below URL