Locking Topics
Lock a topic to end a discussion: everyone can still read it, but nobody can reply to it or edit its messages, moderators included.
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Open the topic, or find it in the discussions list.
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Open its Options menu (⋮) and click Lock Topic.
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Confirm.
The topic shows the Locked badge and the message This topic is locked. New replies and edits are not allowed.
To allow replies again, click Unlock Topic in the same menu.