This is from an Elegant Themes blog post, where they also give some other method options: https://www.elegantthemes.com/blog/divi-resources/how-to-remove-sidebars-from-divi).


/*** Take out the divider line between content and sidebar ***/
  #main-content .container:before {background: none;}

/*** Hide Sidebar ***/
  #sidebar {display:none;}

/*** Expand the content area to fullwidth ***/
  @media (min-width: 981px){
  #left-area {
  width: 100%;
  padding: 23px 0px 0px !important;
  float: none !important;
  }
  }

 

Where to paste the CSS snippet

Navigate to Divi>Theme Options and at the bottom of the default “General” tab, paste the CSS snippet into the “Custom CSS” box and save changes.

 

Child Themes

We recommend using a child theme. It is your insurance against losing your custom work in updates.

Click here for instructions on adding a basic Divi child theme with a stylesheet (for custom CSS).

Click here to learn more about child themes and getting the most out of the Divi theme.

 

Want more module options for your Divi website?

Check out our Custom Modules for Divi
Browse Custom Modules