I have a large file set up as facing pages with the master pages having different margin settings. If I want to change so I will no longer be printing 2-sided output but rather 1-sided, what is the easiest way to change the file? Would I just delete one of the master pages and reset margins?
Off the top of my head, enable layout adjustment before removing or modifying the master.
Layout > Layout Adjustment
Modify the right (?) master (margins).
Verify changes to the live pages.
The master does not explicity need to be removed.
File Document Setup... and uncheck facing pages (and enabling layout adjustment first would be a good idea). One the file is non-facing it will use only the right-hand side of any two-page master.