How can I select the page layout of the Product Page or products individual pages?

How can I select the page layout of the Product Page or products individual pages? I cannot change the page layout when i am logged in as Admin.

I can set the layout from the Store page and that is it? Is there a cascading effect from Store setup that should propagate to the other sub-pages it creates? OR is the only choice using this themes Default page layout?

Respectfully,

David