Hi George,
This is much easier to achieve in GPP 1.6, which is currently in beta. You can update like this: https://docs.generatepress.com/article/beta-testing/
In 1.6, you should be able to do this:
@media( width: 768px ) {
.site-header,
#site-navigation,
#sticky-navigation {
display: block !important;
opacity: 1;
}
#mobile-header {
display: none !important;
opacity: 0;
width: 100% !important;
}
}
@media( max-width: 767px ) {
.site-header,
#site-navigation,
#sticky-navigation {
display: none !important;
opacity: 0;
}
#mobile-header {
display: block !important;
opacity: 1;
width: 100% !important;
}
}