Unchecking the viewer will just not let it show on the screen. It will still work, though. The on-screen viewer is handy if you have a sighted person with you who wants to see what you are reading. I like the viewer, although the terms they use in it are not immediately obvious. "Type in the value" is one I get when I want to print a document in Word and pressed Control P. Why not "Type in the number of copies you want." It also takes for granted your understanding of some screen elements. If you don't know what a "spin box" is, it won't define it. It will just tell you it is there. Francis