If you started the chat thread, you are considered the organizer of the chat thread. Therefore, you have the right to delete the chat thread.
How do I delete a chat thread?
Click the chat's 'i' icon on the top right of the chat interface. Select Delete.
You can also hover with your mouse the index of all your chats. A three-dot menu appears. Select Delete.
How do I leave a chat thread?
If you've been added to a chat thread, you cannot delete the thread, but you can leave the chat thread.
Click the chat's 'i' icon on the top right of the chat interface. Select Leave Chat.
You can also hover with your mouse the index of all your chats. A three-dot menu appears. Select Leave Chat.