Reminder pop up when number of students exceed the quota in the class.
Capacity can be set in the room or in specific class.
1. Go to "More", then "Room", enter the "Capacity" and "Save"
2. Go to Timetable, "Add" to create a new class, enter the " Capacity". Or edit the "Capacity" in existing class.
3. Reminder pop up when number of students in that room exceed the capacity.