Hello,
Mobile menu starts from 992px. If you want to change this breakpoint it requires a lot of additional style customization. But you may add this code in custom css:
@media (min-width: 992px) and (max-width: 1200px){
.main-nav .menu > li > a, .fixed-header .menu > li > a {
font-size: 16px;
}
.fixed-header-area .fixed-header .logo-with-menu + div + div{
margin-left: 0;
}
}
Regards