What are Facing Pages in InDesign? (How to Turn On/Off)

Learn what Facing Pages are in InDesign and how to create/edit them. Details below...
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Facing Pages:
A document with pairs of left and right pages that form spreads.
Not Facing Pages:
A document with stand-alone single pages.
Document Setup:
Located within the File menu, this dialog box allows for the changing of document level options for existing files and includes Facing Pages.
Properties Panel:
With nothing selected within a document, the Properties panel displays document related options. The Facing Pages option is located within the Document section of this panel.
New Document:
The new document dialog box includes a Facing Pages option.