About viewing options
To view PDF documents, you can hide ribbon controls to optimize the working area.
Double-click the currently selected ribbon tab to hide the ribbon; double-click it again to restore.
Select to customize the appearance of the document and the program window whenever the document is opened in future. See Document Properties for details.
Grid display
Use grids to refine the page layout.
Select to access alignment, grid and guide options.
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View Grid: Shows grids on your document page (⌘Command+U).
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Snap to Grid: You can select and move objects so they align with the nearest grid lines and custom guide lines (Shift+⌘Command+U).
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View Rulers: Shows the rulers beside the document area (⌘Command+R). While dragging an object, its position is projected on the rulers.
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View Guides: Displays custom guide (grid) lines.
To add a custom guide (grid) line, drag it off from a ruler.
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Line Weights: Toggles line display between original and schematic weight. If active, then lines appear with their thickness, otherwise all the lines uniformly show up with 1-pixel width, regardless of the actual zoom level.
To deactivate the above options, click the command or use the keyboard shortcut again.
Define grid properties in General options under .