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Press the Shift-Key and make a rectangle-selection with the mouse by clicking-and-dragging. All checkboxes within the selection will change their status (unselected will be checked - and vice versa)

Press the Shift-Key and make a rectangle-selection with the mouse by clicking-and-dragging. All checkboxes within the selection change their status:

• Unchecked checkboxes will be checked
• Checked checkboxes will be unchecked