Team and System Admins can convert public channels to private channels.
Select the public channel name at the top of the center pane to access the drop-down menu, then select Convert to Private Channel. When a channel is converted, its history and membership are preserved. Membership in a private channel is by invitation only. Publicly-shared files remain accessible to anyone with the link.
Default channels such as
Town Square and
Off-Topic can’t be converted to private channels.
Due to potential security concerns with sharing private channel history, only System Admins can convert private channels to public channels via System Console > Channels > Edit (Channel Configuration).
Alternatively, System Admins can perform this action using the mmctl channel modify command.