Thread:Angelo Gabrini/@comment-24727405-20200712153953/@comment-4436931-20200713145804

Found it:

The Navigation menu offers a maximum of 312 links, although it is not necessary to use all of them. The links are grouped as:

4 Level 1 links which combine for a total width of 550px. These are the links that are always visible above the colored menu bar.

7 Level 2 links with a maximum total width of 729px. These are the links that appear on the colored bar when hovering over any of the level 1 links.

10 Level 3 links with a dynamic width and a minimum width of 150px. These appear as dropdown style menus under each of the level 2 links.