Not showing teacher periods in student schedule
In some institutions teachers start working earlier for meeting purposes, those periods should not be displayed in the student view. You recommended me to eliminate those periods before printing and not saving the changes but these could lead to an chaos if unintentionally I press the save button.
The software assumes equal days/periods for all classes, teachers, rooms and subjects so that other features could be possible such as extra views: https://primetimetable.com/help/#extra.
There are workarounds for different number of periods and different period intervals for specific resources and you can read more about that in the user guide: https://primetimetable.com/help/#period&q