●It's a feature that lets you choose one app to play its audio on a different device (like a Bluetooth speaker or headphones) while all other sounds (notifications, system sounds, other apps) play on your phone's main speaker.
● In the "App" section You should choose the app whose audio you want to "separate." This is usually a media app like a music player (e.g., Spotify, YouTube Music), a podcast app, or a video streaming app.
