Display the pages in one column
Display one page at a time (the default)
Display the pages in two columns, with odd-numbered pages on the left
Display the pages in two columns, with odd-numbered pages on the right
Display the pages two at a time, with odd-numbered pages on the left
Display the pages two at a time, with odd-numbered pages on the right
PDF Page Layout enum Defines the page layout to use when the document is opened