When a streamer's category is set to any of the 45 games in the "The Legend of Zelda:" series (except for the first one), the sidebar will only read "The Legend of Zel...".
This leaves it unclear which Zelda game the streamer is playing, until you hover over their entry in the sidebar.

Renaming the categories, e.g. from "The Legend of Zelda: Ocarina of Time" to "Zelda: Ocarina of Time", would fix this.
The first game in the series should still be called "The Legend of Zelda" since it doesn't have a second title.