Change menu dropdown width

The default menu dropdown has a default width, however, you can change the width by adding this code snippet into Theme options > Layout > Advanced > Custom css:

@media (min-width: 992px){
    .nav-style-megamenu>li.nav-item .dropdown-menu {
        min-width: 340px;
    }
}

*You can change the value of the property min-width depending on your needs.