I saw there is a pile of settings related to chat. Is there a way from preventing users from DMing each other while still retaining group channels?
There is Chat allowed groups which you can use to allow users to use chat in general so they can use channels. To disable DM chats, just remove the groups from Direct message enabled groups. Then, members cannot create DM conversations. I think they should still be able to reply if they are messaged, so you can still create group channels with a few members if you need to.
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