Help with full-page viewing

Hi have a nice day.

I started using the Boxstyle template. The latest version. I have one problem. I can’t set a page for full-page viewing. I need to place my CV and the field is too small for that. I need to delete the right menu. It works for posts. How do I do this for the site? Can a template do that? It is a very necessary basic function for me. What can I do about it?

Thank you for your help.

The page I need help with: [log in to see the link]