Wed 31 Dec 2008
In Magento Admin section you can change the layout of the “products” page (from the “manage categories” menu) but there is no option to change the layout of the “product” page.
You can only do that by hand, and you must edit the “catalog.xml” file here: app > design > frontend > default > deault > layout > catalog.xml
Do a search for “Product view” and look for page/2columns-right.phtml some lines below. You can change that to one of the available layouts