The -set-page-layout option specifies the page layout to be used when a document is opened in, for instance, Acrobat. The possible (case-sensitive) values are:
cpdf -set-page-layout TwoColumnRight in.pdf -o out.pdf
The page mode in a PDF file defines how a viewer should display the document when first opened. The possible (case-sensitive) values are:
cpdf -set-page-mode FullScreen in.pdf -o out.pdf
cpdf -hide-toolbar true in.pdf -o out.pdf