What do "Speaker Labels" unders the Visual Filters icon do?
Hovering mouse over Speaker Label has a contextual pop-up: e.g. Matthew 7:21 . . .

Hovering mouse over Speaker Label has a contextual pop-up: e.g. Matthew 7:21
And if you click on the "megaphone" icon, it will take you to the Biblical Facts page for this "person". In this case, this represents a "generic" person addressed by Jesus in a wide variety of passages (which can be an interesting study all by itself).