Gmail change the interface

Google has just changed the message composition window in Gmail.In  past few months, to compose a message in Gmail, giant has decided to offer what seems a new window operating within the same workspace. By clicking, editing window that appears in the upper right corner and if you wanted to access old email meantime, could minimize to return to it later.
From now on, the page that the creation of a message will not be limited in size to that corner of the screen. With one click the full screen button in the top right, you can significantly increase and bring in the middle of the gmail page. If you enchant this option menu accessible via the lower right corner you can set this as the default composition window - 'Default to Full Screen''.