On Sat, Jan 16, 2021 at 11:15 AM, Mdivine wrote:

An icon of a black silhouette head and shoulders with a plus sign on an individual message title on the topics list.

The topic is set to "Reply to Topic Followers Only." Any future messages in this topic will not post to the group.

This can occur manually via the Topic Properties, or automatically via an applied hashtag.

Hope this helps,
Bruce

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