If you're signed in to a work or school account, the options you see might be different. To learn more, contact your administrator.
You can lock conversations if you’re the owner of the group or have permission to lock posts.
When you lock a conversation, you block all replies to posts and other activity on it.
To lock a new conversation: When creating the new conversation, to the right of the subject, click Lock conversation .
To lock an existing conversation: When viewing the topic, in the upper right, click Lock conversation .