If you would like to format the look of your legend in a chart, you simply .....
HOWTO Design the Legend of a Spotfire chart:
If you would like to format the look of your legend in a chart, you simply go into Properties -> Legend and deselect the Legend items you do not want to see (you can do this by right mouse clicking on the Legend itself).
Then you choose if the Legend should be displayed to the left or to the right.
Then you can SWITCH OFF the Column Selectors and the Headers for the SELECTED (clicked-on) legend item.