EDT - How can I postpone all the lessons from one day to the next?

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In all the displays Timetable of the week, select one or more resources from the list on the left.
Right-click and select the command Defer the selection's lessons: a window appears.
On the left-hand side of the window, select the day on which the lessons to be rescheduled take place.

By default, all the day's lessons are taken into account; if you don't want to reschedule some lessons, click and drag on the corresponding slots in the grid to clear the selection.
On the right-hand side of the window, select the day on which the lessons are to be rescheduled; you can also shift the whole day's lessons earlier or later if there are enough slots on the grid.
Click on Validate.

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