
(This assumes that neither the suitably positioned Binder nor a relevant outline is displayed.)
I am thinking about some cue that I would get were I for instance to do a Project Search that found children but not their parents.
Such a cue would be of use, particularly when thinking about an item in a Collection.
(Looking forward I have hopes that the Collections panel will be expanded to show as many of my 20+ Collections as possible, that I will be able to work from there. In such a case the Binder would not be (mostly) visible.
... And then ‘knowing’ that there is an out of sight parent, quick navigation to it would be of use—even were that not a keystroke.

Or a way to open it in the other Editor.
(This is related to a note elsewhere, about seeing somewhere on-screen, not the full path to the item, merely its folder: Here, I'm changing that to '... merely its container'.)