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.
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.
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.)