If user doing open folder and now is opened window, enable by drag and swipe (up/down/left/right) moved opened window to different postion (for example same function as in windows xp, 7, 8, etc.) (in settings for folder add for this settings, some as: pin (yes/no).For example, due sidebar (not to allow move).

 And add to some corner (enable set where is be in settings) cross for closed folder.