Great already!
Just as I wanted to ask for a “collapse all” for treeview, I read, you already working on it 
The filter input is also great! Thanks for that.
But another thing:
I have a lot of pages, which are “parent” folders at the same time (or let’s say, they share the same name).
What bothers me a little (!) bit, it is not clearly visible, if a page has also a folder (or vice versa), as folders are in the upper sections and the pages on the lower.
Could it be possible to somehow combine folders with pages with the same name? Don’t know how exactly this should look like, but maybe the folder with another symbol, if there’s a page with the same name? And then klicking on the symbol to open the folder, click on the text to open the page?
Or add a symbol or change the style (like “bold”) of entries with page/folder combination?
Hope, you understand, what I’m after 