How Do I Unpublish a Course?
If you need to unpublish your course, click the Unpublish button in the sidebar. Students will not be able to access your course.
See the Canvas Guide: How do I publish a course? (scroll to the bottom for the unpublish instructions)
Note: Once your course contains a graded submission, the course status will no longer display in the sidebar and you will no longer be able to unpublish your course.