Plot legend color

[smileyenot983]

Hello, everyone!
It's hard to determine which graph corresponds to which run from the colors. Only edges of the run name circle are colored and they are too thin(attached image)
Is it possible to fill the whole circle with color somehow?

[Raghunath-Balaji]

Which cricle are we referring to? because I see lines up here, is there anything that I am missing?