Could you make the notifications? Could you share the solution if I do it? Thanks!
You may select layout-navbar-fixed from Tools → Advanced Settings → AdminLTE layout class, after that re-generate ALL the script files again.
I was able to get this working in version 2022, without having content covered by the menu, with the following CSS added to the User Stylesheet:
.main-header {
position: fixed;
top: 0;
right: 0;
left: 0;
z-index: 1030;
}
.content-header {
margin-top: 50px;
}