Smart Guides is a new feature that appear when you need them and disappear when you don’t. Smart Guides help you see at a glance how any object or text box you are moving aligns with other elements on the slide or with the center or sides of the slide itself.
Drag an item on the screen.
A smart guide appears on the slide, showing you how the item aligns with the nearest object.
Position the item where you want it to appear and release the mouse button.
Smart Guides change as you move the item, showing how the object lines up at the top, center, or bottom of another element. ...