How to close the class register for classes that finish before the end of school year (graduate classes)

1. First, delete the finishing classes with no further lessons, from the timetable. Then publish a new timetable version and set the validity date.
How can I specify the format of the timetable?
The changes are immediately implemented in Substitutions online.

2. To set a date for the end of school year in the reports and to seal the records in the class register select Class register/Settings in the left menu.
Tag the graduate classes and set the end of study date: How to lock the Class register? (curriculum taught, attendance)