<style>
  /* -- The root styles must go in the element of the structure with the name "Menu slide" in the class "offcanvas-6__menu-slide". --*/ 
  
  /* -- Styles to convert the menu into 2 columns -- */
  .offcanvas-6__menu-slide{
    ul.bricks-nav-menu{
    	columns: 2;
      display: block;
      
      /* - Number of columns for mobile versions -*/
      @media(max-width: 767px){
      	columns: 1;
      }
      
      /* - Top margin of each menu item - */
      li.menu-item:not(:first-child){
      	margin-top: var(--space-m);
      }
    }
  }
</style>