What are you using to access ProConnect Tax?  And which browser do you use?

As you can see from these screenshots, there's a main input screen that runs on and another input screen for supplementary info.  Both have more than 1 input field per screen.

Mine doesn't quite look like that, it acts like i'm zoomed in but i'm just using regular view. I have a larger screen, too so I'm not sure why I'm so limited on my view. I'm using Chrome. 

I want to see the navigation for the return on the left hand side. I've collapsed all other unneccessary items, I think. 

Your looks exactly like mine, except I had my left panel collapsed.  Yours clearly is not "only showing like one box at a time".  Perhaps you meant something else?