I have created a 6 page PDF portfolio on Adobe Acrobat 9 pro. I have the inital view settings set to display as two up (cover page), which displays the cover page as a centred single page, then 2 pages thereafter. However, because there are only 6 pages within my document, the last page is displayed as a single page also. The problem i have is that the last page is aligned all the way over to the left, but i would ideally like to centre the page so the first and last page are displayed as single pages, but centred, and all other pages as a 2 page style. Any suggestions?
The usual way to achieve the view you're looking for would be in the authoring application, by exporting pages 2-3 and 4-5 as spreads (which in the PDF means a double-width page), then you don't need to use 2-up mode. Disadvantage being that readers can't then switch to single-page views.
Another option would be to add page-level javascripts that change the layout mode for each page, using
this.layout = "TwoPageRight";
on pages 2,3,4 and 5; and
this.layout = "SinglePage";
on pages 1 and 6.
It's hacky though, as readers may want to change to something else (e.g. fit width) and the script will keep resetting them back to your choice.
To add a page script, right-click the thumbnail in the pages sidebar, choose "page properties", "actions" and for "page open" choose "run a JavaScript", press ADD and type in your code.