Open your channel settings by right-clicking on the channel name in your channel tree, or by hovering the cursor over the channel name and clicking on the 3-dot button that appears to the right of the channel name.
Use the channel menu to:
Subscribe to all subchannels;
Manage members;
Create new channels;
Channel settings to edit channel description, set up plug-ins or remove a channel without posts;
Sort subchannels;
Move a channel;
Rename a channel;
Mute a channel;
Mark a channel as favorite;
Mark as read;
Collapse a channel;
Expand a channel;
Archive a channel/branch;
Leave a channel/branch
or click the down arrow placed above the channel message window next to the channel name.
Use the channel menu to:
Manage members;
Add Whiteboard;
Move a channel;
Rename a channel;
Channel settings to edit channel description, set up plug-ins or remove a channel without posts;
Mute a channel;
Mark a channel as favorite;
Archive a channel/branch;
Leave a channel/branch.