How do I know if my discussion board message is going to the instructor or the entire class?
The Discussions area in Canvas is a discussion board for the entire class. Any content posted to a discussion thread will be visible to anyone in the class.
If you are in a group, the Discussions area for your group is private and can only be seen by the members of your group and instructors or TAs for the class.
If you need to message your instructor privately, you should use your Canvas Inbox to send him or her a message.