Is it possible to create a timetable if school works in two shifts

Yes, you just need to specify a larger number of lessons per day (for example, 12 lessons) and create a common timetable for both shifts.

Then, with the View, Define, Define views, you can create two different views, such as “Shift 1” and “Shift 2” and assigning to these views corresponding classes.

After that you will be able to view these different parts of the timetable in the program separately.