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If you've recently upgraded to InDesign CS6 and were used to toggling the way in which the page spreads in the Pages panel were displayed from the default vertical to horizontal, you might have wondered what happened to the "Show Vertically" setting previously found in the Panel Options in earlier versions of InDesign.
We access the Panel Options... from the Pages panel menu, and unchecking the Show Vertically option would display the page spreads horizontally. So where did this command go in CS6?
InDesign CS6 introduces the 'Alternate Layout' feature, which required the introduction of a third method for displaying pages in the pages panel: By Alternate Layout.
As a result a new command was added to the Pages panel menu: View Pages, that now allows us to toggle between three different view options.