If you don’t specify a startId, Wayfinder will use
the current doc id as a starting point.
Your ’About’ page has children, so using ’About’ as the starting point you will see the docs below listed.
However the 2nd level ’About’ pages have no children, so when they are the start point Wayfinder will output nothing. That’s why the menu is ’disappearing’. Make sense?
You’ll need to use something like this as was suggested earlier:
[[!Wayfinder? &startId=`[[UltimateParent? &topLevel=`1`]]`]]
which will travel up the tree from the current document and start your subnav menu from the top parent container (in this case, the ’About’ container).
Make sure UltimateParent is installed or it won’t work