Slide sorter view in PowerPoint or OpenOffice Impress is a window that displays thumbnail
versions of all your slides, arranged in horizontal rows. This view is useful to make global changes to several slides at one time. Rearranging or deleting slides
is easy to do in Slide Sorter view.
In order to apply the same transition
to all of her PowerPoint slides at one time, Mary switched her presention to Slide Sorter