Answer: foldout

AnswerCrossword Clue
FOLDOUTHidden bed
FOLDOUTAd man's page.
foldoutthat must be unfolded to be used, read, viewed, etc.
foldoutpage larger than the trim size of a magazine or book, folded one or more times so as not to extend beyond the pages; gatefold
foldouta folded insert in a magazine or book, also GATEFOLD