The Extension section of the Twitch Dashboard will allow you to select "Leaderboard" and view your current leaderboard. From here you can see the name of each user on each tab of the leaderboard. Clicking the red "X" next to a cheerers name will hide that name and replace it with the Hidden Name specified in the Leaderboard config. The default Hidden Name is "Anonymous" but you can change it to whatever you like.
keywords: extensions, leaderboard, hidden, usernames, cheerers