Just so I’m clear, you really can get a pretty awesome full screen look the way I described. This is a capture of my whole screen with Scrivener set up this way (and hiding the OS menu bar, although it hardly adds much more to the top if you don’t do that–it’s not a Scrivener feature, but it’s something you could do if you wanted to go all-out):
Basically to do this, I’d first suggest opening the Layout Manager via View>Layout>Show Layouts and saving your current layout, just to make it easy to return to.
Then in the View>Layout menu, choose Hide Header, Hide Footer, Hide Inspector, Hide Binder (you may want to save this for last, since the binder is the easiest way to navigate documents, although you can use the View>Go To menu and keyboard shortcuts as well; also the shortcut for hiding/showing the binder makes it easy to pop it open, switch documents, and close it again).
In Format, choose Hide Ruler and Hide Format Bar.
Have just one editor open (no split) and in View>Page View choose Show Page View and Two Pages Across.
If you like, in Preferences:Appearance, under Customizable Colors set Editor>Page Background to black (but obviously you can choose any color or texture). In Preferences:Editor, at the bottom under Wrap to Page Mode, select the box to “center pages.”
In View, choose Hide Toolbar (or use the ellipsoid “hide toolbar” button in the top right of the window).
Choose Window>Zoom to Fit Screen, and voila!
Use the Layout Manager to save this layout, and you’ll be able to easily toggle into and out of it. You can even assign your layouts keyboard shortcuts via the OS system preferences to make this as simple as entering traditional full screen.
So. I hope that wasn’t too drawn-out, but I thought it might help to explain it a little better, since you sound like you’re hitting a bit of a hill in your Scrivener learning. The nice thing with Scrivener really is that for the most part, though there are tons of options, you can still just sit down and start writing. But obviously if you have something specific in mind that you want to achieve, figuring out how to do that straight away can be rough. Hopefully the tutorial, manual, and the forums will help you get going!
P.S. You can use Preferences Page Size instead of Printed and adjust the page width for the page view in the Editor preferences, if you don’t want as much right and left black space as you see in my screenshot.