request for ideas: modify collapsed menus in skel-layers.js

[chk1xn]

Hi,

as I'm still a very happy user of the skel template, I'd like to ask for some ideas/hints about my latest endeavour...

My site's content has grown over the years and so did the menus and sub-menus and sometimes even sub-sub-menus to navigate thru. In large screen mode, dropotron works perfectly. It collapses all sub levels of the menus and only shows/expands them when I hover over.

However on small screens the navigation menus are transformed to be shown under the "burger menu" which is (I guess) handled by skel-layers.js.

This particular menu list has all elements expanded which makes navigation a bit hard when there's many menu items.
So I'm looking for code how to have those elemenst collapsed by default and only expanded once I tip/click on an item.

Would anyone have some ideas/hints for me please? Many thanks.

Cheers,
Chris