If your course includes Blueprint icons, your course is associated with a blueprint course. Blueprint Courses are courses managed as a template and may contain locked objects managed by a Canvas admin, course designer, or other instructor.
The Course Details tab in Course Settings will tell you if your course is a blueprint course. Most commonly, your course will not be a blueprint course and you can only manage unlocked content in your course. If your course is a blueprint course, you can lock and sync course content to associated courses.