Can be change the width of columns in the section without using Custom Component

Put the below code on Load of ur form

function setColumnWidths(sectionId,sectionWidths)
{
          try{
                    sectionWidths=sectionWidths.split(";");
                    var sectionBody = $("#fd_component_"+window.FormDesigner.runtimeNamespace+sectionId).find(".formSectionBody")[0];
                    if (sectionBody)
                    {
          for(var currentColumn=0 ; (currentColumn<sectionWidths.length)&&(currentColumn<sectionBody.children.length) ;currentColumn++)
          {
                               sectionBody.children[currentColumn].style.width=(sectionWidths[currentColumn])-2+"%";
                     /* -1% for column margin*/
          }
                    }
          }                    
          catch(err)
{/*Do nothing if error occurs*/}
}

setTimeout(function(){setColumnWidths("sectionID","80;20");},20);