In my opinion the description of the 'structure view' is misleading and it's functionality doesn't fit the expectations of most users.
For example: I have a simple graph of parents, children and grandchildren (see attached image). The use of 'layout -> hierarchical' shows the given view.
It's a tree, right? The description of the 'structure view' says: "This tool window presents the hierarchical structure of the graph shown in the active editor window using a tree-like view." (http://yed.yworks.com/support/manual/structure.html)
So I would expect that the 'structure view' reflects the hierarchical structure of my graph in a tree-like view, but it does not! It still shows a plain list.
That is very confusing. Furthermore modifying the structure "by dragging a (group) node's entry onto another entry" is not possible at all. It turns out that is only supported for groups. Is this behaviour intended or is it a bug?