Besten Dank für den Tip.
@media (min-width: 768px) and (max-width: 1189px) {
.slicknav_menu {
display: block !important;
}
.menu{
display:none !important;
}
.sub-menu .menu-item-has-children> a:after,
.menu-item-has-children> a:after{
display:none;
}
.slicknav_nav {
margin-left: 0px;
margin-right: 0px;
}
}