When a " Education Catalog" is selected, all groups of this catalog will be listed and if this course/lesson is added to any of the groups or subgroups of the catalog, the checkbox of the relevant group will be displayed as checked.
If the course is not added to a specific group and you want to add the course to that group, you can do so by selecting the checkbox for that group. This will update the Course Enrollments for the Catalog Group .