If you're wondering how to move your deviations around within your Gallery or Group's Gallery, here's a helpful post by Riveree
If you want to go back to the Pages set up (rather than use the new Tumblresque Scrolling Forever Style), simply open your Settings , go to the Browsing tab (over on the left side of your screen), and click the drop-down menu next to Paging. You'll want to click on the Click Through Pages setting (the default is probably Scroll Through Pages aka the Tumblresque thing). Then click Save. Now while the images will still look different, you won't be continuously scrolling forever through your Gallery or Favorites or whatever.