I bought a PDF version text book for school. EVERYWHERE throughout the document are annoying frames; border frames, page frames, column frames, etc. sometimes the boxes seem to have nothing to do with what is on the page. They are disruptive, distracting, and visually annoying. How do I remove or hide them? These are NOT text boxes or superimposed comment boxes. It is a 600+ page book and every single page has black page borders, column borders, and borders around "special content."