View channel subscribers
Who is subscribed to a channel determines who receives the messages sent there. All non-guest users can view public channels and subscribe themselves. Organization administrators can configure who can subscribe and unsubscribe other users to channels.
View channel subscribers
Section titled “View channel subscribers”- Click on the gear () icon in the upper right corner of the web or desktop app.
 - Select Channel settings.
 - Click All in the upper left.
 - Select a channel.
 - Select the Subscribers tab on the right.
 
- Click on a channel in the left sidebar.
 - View subscribers in the In this channel section in the right sidebar. If the section is collapsed, click In this channel to reveal it.