Every tile below is the real overlay page, running with a sample track. Click one to apply it, and move the width slider to fit a browser source that is not quite the right shape.
Every style has a width of its own, a ticker bar crosses the frame, a poster tile does not. Moving this pinches the box without changing anything else about it; “Style default” hands it back. The previews below follow it.
The pet is the same animal everywhere, so hiding it here hides it in the hub too, and a theme chosen here is the one the tray and the hub show. Your own placement means the spot and size you set elsewhere, kept as they are.
The previews above show a generated sample so the shape is visible while nothing is playing. With the app running the bars follow the music you hear. Only the overlay asks for this: a browser source with the visualiser off costs nothing.