Remove/Hide legend title and circle from floating info box

[KrishnaRLolage]

I am using filled line graph. I want to show floating info boxvon user touch.
I have added the same, but in the floating info box, I see a circle (same colour as filled chart colour) and the legend title.
I don't want to show the legend title so I set it empty string. But now, the circle beside the title is still visible.
Shouldn't it be hidden/removed if the legend title is empty string?
Is there a way I can only show the description or hide that circle?