Alignment guides appear and disappear as you drag objects around a slide canvas, providing you with instant feedback about relative object position. For example, you may see alignment guides appear whenever objects are aligned at their centers or at their edges.
Similarly, relative spacing guides may appear when you have three or more objects lined up on the canvas. If you drag one object into a line of objects, so that it’s equidistant from the middle object, relative spacing guides display the distance between each pair of objects in ruler units.
Relative sizing guides appear when two or more items lined up on a slide canvas have the same height or width.
These guides appear only while you’re dragging an object. When you let go of the object, the guides vanish. You can make alignment and relative spacing guides appear in different colors so that it’s easier to know what is coming into alignment as you move objects around. If you turn on alignment guides or change their color, the settings apply to all the documents you open in Keynote.
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To set alignment guide options, choose Keynote > Preferences, and then click Rulers. Select the Object Alignment options that describe when you want alignment guides to appear:
To show guides when an object’s center aligns with another object or the center of the slide, select “Show guides at object center.”
To show guides when an object’s edges align with another object, select “Show guides at object edges.”
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To change the color of alignment guides, click the Alignment Guides color well and select a color in the Colors window.
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To set relative spacing guides, select the Object Spacing & Sizing options that describe when you want guides to appear.
To show distance between three or more equidistant objects in a line, select “Show relative spacing.”
To show that objects in a line have the same height or width, select “Show relative sizes.”
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To change the color of relative spacing and sizing guides, click the adjacent color well and select a color in the Colors window.
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To show or hide guides while you work, choose View > Show Guides or View > Hide Guides.
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To momentarily hide guides, hold down the Command key while you drag an object.
Another way to align objects is to use gridlines on the master slide or specify precise object position by using x and y coordinates on the slide. See Using Master Gridlines and Positioning Objects by x and y Coordinates.
Creating your own alignment guides wherever you need them on each slide can help you place objects in the same position on different slides. See Creating Your Own Alignment Guides.