Remove margin in pages?
Solution 1:
There is an additional set of margins in a Pages document.
I exported a document to Pages '09 and opened it with the old version. In the Layout Inspector, I found the "Layout Margins". The "Left" and "Before" margins were non-zero and the numbers matched the unwanted margins I saw in Pages 5.2. Here's a sample:
I changed those layout margins to 0, saved the Pages '09 document, and opened it in Pages 5.2. Hurrah! The unwanted margins are gone!
If there's a UI control to view or change the Layout Margins in Pages 5.2, I haven't found it.
Update: BigCaseyDog's answer describes the Document Margins, which are available in Pages 5.2 as well as Pages '09. In Pages '09, the Layout Margins are available in addition to the Document Margins. The Pages 5.2 templates -- at least some of them -- are built with non-zero Layout Margins, but Pages 5.2 doesn't seem to give us a way to change the Layout Margins.
Solution 2:
In the most recent version of Pages, you can adjust the margins similarly as previously mentioned, but it's in a slightly different place. Click the Document button in the top left corner of the window, then look under Document Margins in the inspector that appears. You should be able to adjust all of those to zero to get rid of the margins (if you want to get rid of the upper and lower margins, you'll have to uncheck the boxes for Header and Footer right above the Document Margins section). Hope that helps.