nav.top_menu>ul:not(.off-canvas)>li>a:hover:after, nav.top_menu>ul:not(.off-canvas)>li.current_page_item>a:after{display:none !important}
you can place this in theme options – general options – custom css
nav.top_menu>ul:not(.off-canvas)>li>a:hover:after, nav.top_menu>ul:not(.off-canvas)>li.current_page_item>a:after{display:none !important}
you can place this in theme options – general options – custom css