Fullpage without sidebar

Hello,

It is possible for static pages: when you edit the page, choose the appropriate “Template” in the “Page attribute” box on the right.

For the blog and blog posts however you’ll need to either add some custom CSS to hide the sidebar and make the column content full width, or to create a child theme with custom full width templates.

By the way, this is unrelated to the question and the theme, but you should consider updating WordPress to the latest version (for countless reasons).