Green in enroll checkbox
On the scheduler's edit offerings tab, you'll see in the expanded menu that there is an option that says 'Green in enroll.'
In almost all cases, this checkbox is checked. For offerings that shouldn't make the enroll students list item turn green, the box can be unchecked.
Students who are signed up for offerings that are not checked 'Green in enroll' will look like this on the Enroll Students page: Yellow for the specific square that they are signed up for and red for the row.