More legibility!
Hey, authors of Adobe Reader!
The most documents read in your program has vertical orientation. And the user read this vertical-oriented docs in a modern wide-screen monitor. It is quite complicated to work with documents because letters become tiny in a one-page view.
Please, take a look at a possibility to make vertical-oriented menu fields to make the document use full height of the screen. See picture related.
You can give to the user the choice to use horizontal menu or vertical menu.
Thank you.