To create a thread,
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Hover over the message you'd like to reply to.
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Click the kebab icon
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Select Reply in thread.
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Type your reply. Check the Also send to channel box below your message if you want to send your response back to the channel.
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Click Send.
You can also click the
thread icon to create a thread when you hover over a message.
Close threads
To close a thread, click the
close icon on the thread header.