You can control the colors used to display guides for page margins and columns, as well as the guides for the bleed and slug areas on the pasteboard. To make it easier to distinguish between the Normal and Preview modes, you can change the color of the preview background.
InDesign also lets you control how close an object needs to be to snap to a guide, whether guides should be displayed in front of or behind objects, as well as the size of the pasteboard.
You can change the on‑screen color of your paper. With no text or objects selected, double-click the Paper color in the Swatches panel (choose Window > Swatches). The Paper color appears on‑screen only and does not affect output; it is intended only to simulate designing for nonwhite paper.
After you create a document, you may change your mind about how you want it set up. For example, you may want single pages instead of facing pages, or you may want to change the page size or margin settings.
Changing options in the Document Setup dialog box affects every page in the document. If you change page size or orientation after objects have been added to pages, you can use the Layout Adjustment feature to minimize the amount of time needed for arranging existing objects. See About automatic layout adjustment.
You can change column and margin settings for pages and spreads. When you change the column and margin settings on a master page, you change the setting for all pages to which the master is applied. Changing the columns and margins of regular pages affects only those pages selected in the Pages panel.
The Margins And Columns dialog box doesn’t alter columns inside text frames. Text frame columns exist only within individual text frames, not on the page itself. You can set up columns within individual text frames by using the Text Frame Options dialog box. (See Add columns to a text frame.) Text frame columns can also be affected by the Layout Adjustment feature.
To change margin and column settings for one spread or page, go to the spread you want to change, or select one spread or page in the Pages panel.
To change margin and column settings for multiple pages, select those pages in the Pages panel, or select a master that controls the pages you want to change.
Type values to specify the distance between margin guides and each edge of the page. If Facing Pages is selected in the New Document or Document Setup dialog box, the Left and Right margin option names change to Inside and Outside, so that you can specify additional inside margin space to accommodate binding.
When you have more than one column on a page, the column guides in the middle appear in pairs. When you drag one column guide, the pair moves. The space between the column guides is the gutter value you specified; the pair moves together to maintain that value.
You cannot create unequal column widths for columns in a text frame. Instead, created threaded, side-by-side text frames with different column widths.
To create columns with unequal gutters, create evenly spaced ruler guides and then drag individual guides to the desired location. (See Create ruler guides.)