The custom CSS below can be used to modify the submenu. I currently only have the metric for line-height + color but you can add in whatever you’d like.
.header-mobile-social-media a i, .sh-nav-mobile li a, .primary-desktop .sh-nav > li.menu-item ul a { color: #0a0a0a!important; line-height: 40px;
I hope you are well today and thanks for helping out here in this forum by sharing the solution but it is not clear what you shared CSS code modify in the submenu so could you please describe it a bit more in detail?