Initial situation: If a student is present at the beginning of the lesson, you will first mark them as present when you check the attendances or absences and confirm them in the digital class register.
If a student leaves the lesson earlier, click again on the relevant subject in the timetable and then on the confirmed attendance:
Operate the green slider that represents the student's presence. The following window opens:
Here you can indicate at what time the person left the class.
In the list of attendances and absences, the student then appears under those absent, but is marked as "Left earlier".