This answer is only relevant for students:
If you have adjusted your schedule and you are not able to see all of the subjects after choosing a course, it could be that you made a mistake while choosing a subject. In order to be able to choose the course again, ask the school's Sdui admin to reset your course selection again. As soon as this is done, the following banner will be displayed in the timetable view:
You can now go through the course selection again.
IMPORTANT : On the "Last Check" page, carefully check again whether all subjects are correctly selected or deselected.
You can select or deselect the course by tapping the check mark to the right of the subject.