Groups menu does not fit into screen when too many groups are followed, also not being able to scroll the list and access all the items is annoying too. Workaround: css shown below (add this to user/group/etc custom css until this gets added to main site code)
@media screen and (min-width:1024px) {
.navbar-dropdown {
overflow: auto;
max-height: calc(100vh - 3.25rem)
}
}