The Dashboard Images for Courses is the additional option available for all instructors to turn on by themselves in the Feature Options tab.
If this is frequently requested by most of the instructors across the district then we should consider to turn on by default globally.
Here is how to turn on the course dashboard image as an instructor.
1. Go to Course > Settings > Feature Options
2. Turn on Enable Dashboard Images for Courses
3. Then Go back to Course Detail tab and click Update Course Details button at the bottom of the page
4. After that, you will see the Image setting to choose the image in Course Details tab