The parameters of every InDesign document are controlled using the Document Setup dialog box. This box appears in response to the File > New > Document command. The Document Setup box, when it initially appears, controls document parameters such as the size of pages, the total number of pages, whether pages are formatted as double-sided or not, and the positions of page margins and columns. To return to the Document Setup box after you’ve started work on a document, choose File > Document Setup.