Is there such a feature?
Hi ShalokShalom and welcome to the Mattermost forums!
Can you please be a bit more specific - what feature are you looking for?
As you can see, one lovely method to see the content of my server, and that with no former registration.
OK, got you - so you would like to see a searchable interface for all public channels on a server with also live updates.
This can only be done via creating your own Mattermost client that fetches this information with a bot account in the background and displays the channels and messages like you see it here; Mattermost itself does not provide such an interface (at least not to my knowledge) and I’m also not aware of a plugin that does this.