I'm looking at alternatives to Slack to create a loose news, announcements, and collaboration forum for a very loosely structured but large non-profit where the majority of the members are youths and young adults. Mattermost fits the bill nicely - but leave/join messages sort of kill collaboration since many of the members have anxiety; they are more willing to participate if they can see what is happening without strings attached so to speak. How can I hide these messages, and can it be done on a per channel basis or globally all at once?
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