Public Groups and Channels. All groups and channels are private by default, but you can
make them public and open for any user to join or subscribe.
Public groups and channels appear in Global Search results, can reach an
unlimited audience and host
massive communities for any interest – from cats to cryptocurrency.
You must be the
chat owner to change the group or channel type.
On Android tap the
Chat Header > > Group/Channel Type.
On iOS tap the
Chat Header > Edit > Group/Channel Type.