Book menu option that I never saw before in Lichess ( this is not available to me)

I just saw a stream by Eric Rosen and saw an option in his book that i have never seen before and that i can't activate at home. I tested it with Linux Firefox, Chromium and Chrome.
Here's what I saw:
clips.twitch.tv/PolishedSuperEagleRitzMitz

This appears only in studies, when you click on one of the "top games" or "recent games".
Clicking a game in the analysis board opening explorer just opens the game.

Thanks!