Adobe InDesign - Manual (Page 247)

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Delete Empty Pages
If your layout includes design elements specific to the right or left side of the spread, turn on this option. If your left and right pages are
interchangeable, you can turn off this option. This option is dimmed if the document does not have facing pages.
Select this option to delete pages when you edit text or hide conditions. Pages are deleted only if the emptied text frame is
the only object on the page.
To see how Smart Text Reflow can let you use InDesign as a text editor, create a document with Facing Pages turned off and Master Text
Frame selected. In Type preferences, make sure that Smart Text Reflow and Delete Empty Pages are selected. On the first page, hold down
Ctrl+Shift (Windows) or Command+Shift (Mac OS), and click the master text frame to override it. When you type enough text to fill this text
frame, a new page and text frame is added automatically. If you delete enough text, a page is removed.
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