[Theme: Magazino] Changing the full-page width

Hello people,

This is my first time posting here and i am not so experience in working with CSS, so i would be very grateful if u can tell me if it’s possible to change the default full-width pages for my theme Magazino and make them normal width by that creating space to put widgets on the sidebar.

Here is a screenshot with an idea how i want my pages/posts to look if this is possible. https://prntscr.com/2vowbc

HERE you can see me website.

I thank you in advance and i appreciate every answer.