Create ruler guides
The horizontal and vertical rulers let you check the size (length and width) of an object. Once turned on, the rulers will be displayed on the top and to the left of the Document Pane. For aligning objects, you can also create guides in your document.
View rulers
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Choose View > View Rulers.
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To hide the rulers, deselect View Rulers to turn it off.
Create new ruler guides
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Choose View > View Rulers.
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Do either of the following to create new ruler guides:
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Click on the horizontal ruler and drag it down to create a horizontal guide, or click on the vertical ruler and drag it from left to right of to create a vertical guide.
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Double-click a location on the horizontal ruler to create a vertical guide, or double-click a location on the vertical ruler to create a horizontal guide.
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To hide guides, deselect View > View Guides.

A. Horizontal ruler guides and B. Vertical ruler guides appear on a page where View Guides is on.
Change guide colors
You can change guide colors in the Preferences dialog box.
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Do any of the following to open the Preferences dialog box:
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In the Preferences dialog box, choose General > Units & Grids.
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Click the Guide Color square and choose a predefined color from the color palette or define a custom color.