add to child theme css

/* remove divi default effects for items with a drop down menu */
‪#top‬-menu .menu-item-has-children > a:first-child {padding-right: 0px; padding-bottom: 17px!important;}
#top-menu .menu-item-has-children > a:first-child:after{content: ”; margin-top: -2px;}
#top-menu .menu-item-has-children {padding-right: 0px;}