Guides are auxiliary horizontal and vertical lines that are used to uniformly arrange similar elements on presentation slides.
Guides are added by the user and placed in the required order. For example, in the image below, guides have been added to the presentation to help you place 8 images on each slide with equal spacing between them and from the edge of the presentation.
You can add, move, and delete guides simultaneously on all slides in the presentation. For example, if you add a guide to one slide in a presentation, it will appear on all other slides.
