If you initally make a thread, you can make it a group announcement, but can you make an already made thread into a group announcement? What if you accedentially unpin a group announcement and want to make it one again? How can I do this?
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You'd have to recreate the thread entirely. Otherwise, you could take any existing thread and display it publicly for all to see (not that you could just open your group anyways). But the point is you can't adjust the "type" of thread, whether is be announcement, question, poll etc after it's posted. Your best course of action is copy/paste, insert bb code where applicable and recreate the thread.
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You don't