Changing the scale of the UI does not affect the problem. My standard scale is 150% and even if I change the scale by 80%, the interface can not be closed.
80% scale: http://i.imgur.com/aVprm6R.png
ps: the resolution of my monitor is 1920*1200
psps: usually to close interface i just put any item in mod search icon, that cause to open new smaller interface which i can close:
http://i.imgur.com/iZWiTMa.png
But sometimes, instead of this compact interface, is constantly opens an extended interface which i can not be closed. All I can do in this case is just load the previous save.