Hello,
We use static blocks to create the Mega Menu on demo – https://prnt.sc/umw3dr https://prnt.sc/umw3nx https://prnt.sc/umw43q
Or you can add the next custom CSS code in Theme Options > Theme Custom CSS > Custom CSS for desctop:
.et_b_header-menu .item-design-mega-menu li > a {
border-right: 1px solid #e1e1e1 !important;
}
.et_b_header-menu .item-design-mega-menu li:last-child > a {
border-right: none !important;
}
Regards

















