Hi there,

Thank you for your message.

Please add the following CSS to Appearance -> Customize -> Additional CSS:

/* Change desktop submenu width */
@media (min-width: 992px) {
    .main-navigation .sub-menu {
        min-width: 350px;
    }
}

This will set the minimum width of the submenus to 350 pixels for desktop screens.

Another option is to let the submenu width varies automatically on the length of the texts, you can add this one instead of above CSS:

/* Change desktop submenu width */
@media (min-width: 992px) {
    .main-navigation .sub-menu {
        min-width: max-content;
    }
}

Hope this helps.

Awesome, you're welcome!