Nautilus command

Hi,
** when Nautilus (or any other programs like firefox, libreOffice, ...) is on full screen, impossible to minimize or close the window. I had to change desktop and return to desktop where Nautilus (or other programs) is open to manage windows.
Bug on Nautilus file explorer :
** No way to open Nautilus in "arborescence" (scuse me it's in french) files and dossiers vue : It's difficult to use "copy and past" in another way. I had to use another file manager like krusader, or other file manager but no Nautilus. (By the way, in the older version of Ubuntu (12.10), Nautilus works good with all options : Why don't it work with ancient options?
Thanks