The Navigator panel (Window > Object & Layout > Navigator) contains a thumbnail of the selected spread, so that you can quickly change the view of a document.

Alternate between viewing one or all open spreads
Choose View Active Spread/All Spreads from the
Navigator panel menu. Use the scroll bar to view spreads before
or after the current spread.
If you decide to view all spreads, viewing
may be easier if you resize the Navigator panel to make it tall
and narrow.
Magnify or reduce the view using the Navigator panel
Do any of the following:Click the Zoom In or Zoom Out buttons at the bottom of the Navigator panel.
Drag the Zoom slider at the bottom of the panel.
In the Zoom text box, type the magnification or reduction percentage and press Enter (Windows) or Return (Mac OS).
Change the color of the Navigator panel view box
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