As team owners of a class, teachers can delete conversation threads.
Navigate to the channel with the thread you’d like to delete, then select the Conversation tab.
Select More options next to each message in the thread and select Delete.
Expand the entire conversation to see each individual message.
If you delete every message in a conversation, the whole conversation thread will vanish.
Note: Files that you added within a deleted conversation thread are still accessible in the Files tab.