On the Browser:
Log in to the website.
At the top navigation bar, click My Channels > Channels You Follow.
Locate and click the channel you'd like to unfollow.
Click Following.
Click Leave Channel.
On the App:
Open the app.
Tap your initials or profile picture.
Tap My Teams.
Locate, tap, and hold the desired team.
Tap Leave.
Tap Leave to confirm.