I think I have found an answer from a previous request. I didnt really know what the terms were for what I was trying to do but Leo has posted this in the answer to:
Support › Expand submenu on mobile while on subpage
July 10, 2017 at 4:27 am
@media (max-width: 768px) {
.main-navigation .main-nav .current-menu-item .sub-menu,
.main-navigation .main-nav .current-menu-ancestor .sub-menu {
opacity: 1 !important;
display: block !important;
left: auto;
right: auto !important;
position: relative;
width: 100%;
clear: both !important;
top: auto;
float: none;
}
.current-menu-item .dropdown-menu-toggle,
.current-menu-ancestor .dropdown-menu-toggle {
display: none;
}
}
I don’t however know what to do with it or where to add it?
Thanks,