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  How to change the status of a lesson?

Choose a display in a grid or in a schedule. By right-clicking on a lesson, you can:

• de-position: the lesson is not deleted from the database, but it loses its place in the timetable;
• unlock: the lesson can be moved;
• lock non de-positionable: the lesson can be moved, but it cannot be de-positioned in the case of an automatic placement.