Hi, sorry for the delay! I was on a vacation.
If the long sub menus don’t have any further sub menus, you could apply custom max-height via some additional CSS. For example, add the “scrolling-sub” class to the UL element of any long sub menu and then use the following additional CSS:
ul.scrolling-sub {
max-height:500px;
overflow-y:auto;
}
Cheers!