Whats the new selection on the hud?

When you're in game it's on the hud, with the champion info and runes panel (right by your champs picture) I haven't seen anything about this anywhere so I'm just wondering

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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