full-width page

This is probably a super basic question, but I’m new to WP and am stuck. How do you make a page (other than the front page) full-width so that it’s not displaying a sidebar? All the online forums I can find, including the theme page, make it seem like it should be an option in the page attributes, but the only options I see are for Parent and Order.

I’m using the free version. Please explain as if you’re talking to an idiot ??

Thank you!