The Course Visibility call out appears on the Favorite Course tile on the Personal Dashboard homepage if your course is not yet visible to learners. You may not be able to edit either the active status or the course availability dates if you do not have the required permissions to do so. If you do not see any notification then your course is already visible to students.
If you have permission, you can modify the start and end dates for your courses and make them Active directly from your Personal Dashboard homepage.