Hi there,
Give this CSS a shot:
.main-navigation .dropdown-click .main-navigation ul ul {
display: block;
left: auto;
right: auto;
opacity: 1;
visibility: visible;
pointer-events: auto;
height: auto;
overflow: visible;
text-align: center;
}
I added text-align: center;
above to center the submenu, feel free to remove that line if not needed.
Adding CSS: https://docs.generatepress.com/article/adding-css/
You should be able to style the rest in the customizer.
Let me know if this helps ๐