Locking forums and forum topicsYou can lock a forum when you want to prevent users from contributing to the forum or making updates to existing posts. If you do not want to lock an entire forum, you can control access at topic level by locking forum topics.
You must be the Forums administrator or the forum owner to lock a stand-alone forum or a topic in a stand-alone forum. To lock a community forum or community forum topic, be a community owner or the Forums administrator.
Locking and unlocking forums
You can lock forums to prevent users from adding new topics or posting responses to existing topics.
Locking and unlocking forum topics
Lock a forum topic when you want to prevent people from editing the topic or posting responses to it.
Parent topicManage forums
Work with forum topics