When you join a stream, the person sharing their screen will get an alert that you’ve tuned in. Swipe up from the bottom of the screen to see options to turn on your camera, turn on or mute the sound or microphone, or leave the stream. You’ll also be able to change the stream’s volume and share your own screen in return. The red icon with a monitor will remove you from the stream, not the voice channel. You’ll have to tap the red phone icon to remove yourself from the voice channel.

Tap Stop sharing from the Discord screen to stop broadcasting your screen. [1] X Research source

Tap Stop sharing from the Discord screen to stop broadcasting your screen. [1] X Research source