Sidebar on some pages only?

I am looking to have some pages with a sidebar menu and other pages full width.

Is there a way to do this?

I noticed in the premium theme that there is the option to make pages full width, which you can also do in the free version. Does the premium version let you choose which pages are full with and which ones have sidebars.

My website is onelayer.net

Basically what I want is for my gallery and contact pages to be full width with no sidebar, and I want my projects page to have a sidebar, and all the pages within the projects sidebar navigation to have sidebars as well.