I’ve found that add-on.
But is it possible to show only the subpages of one top-level page in this menu?
For example:
Top-level pages : A B C D
Sublevel : B1 B2 -> these only need to show up in subnavigation when clicking on top-level page B
Sublevel : C1 C2 C3 C4 -> these only need to show up in subnavigation when clicking on top-level page C
Thanks!