Document Page Size

This subject is addressed in countless postings, although it continues to be your source of frustration by several users. Adobe's typical response: Go to Preferences/Default Layout and Zoom/Page Display/Rendering/Custom Resolution/ or some variation thereof.

Sure enough, this process does work to some degree, but I can't help but think it would be easier to add; +/- button on the main screen, much like when you open a pdf from a webpage.

This idea is so rudimentary, perhaps the feature is right in front of me, and I can't find it. Please advise.