To close the active document, you can:

• click the cross button in the right corner of the title bar of the document window:
  
• choose the File | Close menu command.
• press CtrlW.
• grab the document's button on the Document Bar and drag & drop it outside the Document Bar.

To close all open documents at once, click the Close all documents button of the File toolbar , or choose the "File | Close All" menu command. Note: you will keep the active document open on its own if you press and hold the Ctrl key when using the "close all documents" command.

To reopen a recently closed document, use the drop-down menu of the Open document button of the File toolbar :

or choose the "File | Recent Documents | Recently Closed" menu command.

See also...