Problem is fixed by Mendix, download new theme from appstore:
https://appstore.home.mendix.com/link/app/2199/Mendix/Mendix-Theme
In lib.css, this is the new code for the region-sidebar, height is removed, bottom 0 px,top is required to move the menu down below the heading:
@media (min-width: 768px) {
.layout-sidebar-responsive .region-sidebar-fixed {
position: fixed;
top: 60px;
bottom: 0;
z-index: 10;
display: block;
overflow-x: hidden;
overflow-y: auto;
padding: 0;
}
}
I've indeed seen this problem to. Although I don't know how to fix this yet, you could consider decreasing the padding on the menu items so that they'll fit onto the sidebar.
I have come closer to the source of the problem: it only occurs with the Sidebar_Full_Responsive lay-out. The Sidebar-Left layout does not have the problem. So it has to do with the way the containers on the content part of the lay-out are handled. Do not know if it is a bug or can be fixed with styling (combination of region-sidebar, region-sidebar-fixed and hidden-xs?).