The teacher can now delete an entire class's meal pre-selections, all at the same time, to avoid the Kitchen/Caterers making meals for students who will not be in school for the day.
This is done in the Whiteboard class selection page by holding down the Ctrl button and clicking on the class name (i.e. Jellyfish Class).
Press the button labelled OK  to continue with the deselection.
Press the button labelled Cancel  to cancel the deselection.