When you select the Facing Pages option in the File > Document Setup dialog box, document pages are arranged in spreads. A spread is a set of pages viewed together, such as the two pages visible whenever you open a book or magazine. Every InDesign spread includes its own pasteboard, which is an area outside a page where you can store objects that aren’t yet positioned on a page. Each spread’s pasteboard provides space to accommodate objects that bleed, or extend past the edge of a page.

A. Page icons B. Page with master “A” applied C. Selected spread
When you set the Binding option to Right To Left in the Document Setup dialog box, numbers are attached to the page icons from right to left in the Pages panel.
Note:
In a long document, you can move to a page quickly by choosing Layout > Go To Page.
The Pages panel provides information about and control over pages, spreads, and masters (pages or spreads that automatically format other pages or spreads). By default, the Pages panel displays thumbnail representations of each page’s content.
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Select an icon size for pages and masters.
Select Show Vertically to display spreads in one vertical column. Deselect this option to allow spreads to be displayed side-by-side.
Select Show Thumbnails to display thumbnail representations of the content of each page or master. (This option is not available if certain options are selected for Icon Size.)
You either select or target pages or spreads, depending on the task you are performing. Some commands affect the currently selected page or spread, while others affect the target page or spread. For example, you can drag ruler guides only to the target page or spread, but page-related commands, such as Duplicate Spread or Delete Page, affect the page or spread selected in the Pages panel. Targeting makes a page or spread active and is helpful when, for example, several spreads are visible in the document window and you want to paste an object onto a specific spread.
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To both target and select a page or spread, double-click its icon or the page numbers under the icon. If the page or spread is not visible in the document window, it shifts into view.
Tip: You can also both target and select a page or spread by clicking a page, any object on the page, or its pasteboard in the document window.
The vertical ruler is dimmed alongside all but the targeted page or spread.
To select a page, click its icon. (Don’t double-click unless you want to select it and move it into view.)
To select a spread, click the page numbers under the spread icon.
Note:
Some spread options, such as those in the Pages panel menu, are available only when an entire spread is selected.
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To add a page after the active page or spread, click the New Page button in the Pages panel or choose Layout > Pages > Add Page. The new page uses the same master as the existing active page.
To add multiple pages to the end of the document, choose File > Document Setup. In the Document Setup dialog box, specify the total number of pages for the document. InDesign adds pages after the last page or spread.
To add pages and specify the document master, choose Insert Pages from the Pages panel menu or choose Layout > Pages > Insert Pages. Choose where the pages will be added and select a master to apply.
You can assign colored labels to the page thumbnails in the Pages panel. For example, you can use color labels to indicate the status of the pages, such as a green label for complete spreads, a yellow label for spreads being worked on, and a red label for unstarted spreads.
The color label appears below the thumbnail in the Pages panel.
Applying a color label to master pages affects all pages to which the master is applied. However, when you apply a color label to individual document pages, the color label for the document pages is used. To use a color label for master pages, select the document pages you want to change and choose Color Label > Use Master Color from the Pages panel menu.