The new version that was released this week brought a great improvement in navigating parent projects and child projects: The project selector is now on the active project by default, enabling me to see where I am in a hierarchy of projects right away. Thank you for that feature!

There is a widget called "subprojects", too, and that has a "1986-feel": I get a list of all subprojects without line breaks. It looks like this:

I would wish for a widget that shows me the structure like this: