I don't have this addon, but IMHO there is not necessary take a look at some demo. The documentation and description of the addon is pretty clear: https://brivium.com/resources/extra-navigation-menu.96/ Really nice addon btw. it's in my wishlist.
But, as user, you can not see anything. just links and tabs. If you want to see a demo as admin in some ACP, then you will have to request access at some demo. (via ticket) Anyway as i said, the pictures and description it's self explanatory.
You can see this add-on demo at here (brivium.com). We are using this add-on for display navigation. Regards,
