Two kinds of nonprinting grids are available: a baseline grid for aligning columns of text, and a document grid for aligning objects. On the screen, a baseline grid resembles ruled notebook paper, and a document grid resembles graph paper. You can customize both kinds of grids.
The baseline grid covers entire spreads, but the document grid covers the entire pasteboard.
Baseline grids and document grids appear on every spread and cannot be assigned to any master.
The document grid can appear in front of or behind all guides, layers, and objects, but cannot be assigned to any layer.
You can set up a baseline grid for a frame by using the Text Frame Options. (See Change text frame properties.)
The Snap To Guides command controls both snapping to guides and snapping to the baseline grid.
To put guides behind all other objects, you can also choose Guides In Back in the context menu that appears when you right-click (Windows) or Control-click (Mac OS) an empty area of the document window.
To show or hide the baseline grid, choose View > Grids & Guides > Show/Hide Baseline Grid.
To show or hide the document grid, choose View > Grids & Guides > Show/Hide Document Grid.
When snapping is enabled, moving an object within the snap zone of a grid location will cause the object to snap to that location.