I don't know what to call this, but it's the PDF and DOCX files on my desktop that shows left and right arrows when I hover my mouse over them. It's annoying, and I wan't to disable this useless feature. It's useless to me because I'm not getting any useful information from the tiny thumbnail by flipping the pages, and I have no plan to make them any larger. Does it serve any other purpose that I'm not aware of? I'm a long time Windows user, and switched over to OSX in November 2013. Screen capture attached.