Application or document control Close closes the active application window.
To close the application or document:
Click the button in the upper right corner of the title bar
Or click the application/document control button in the left corner of the title bar and select Close
Or right-click the title bar and then click Close
Or press ALT+SPACEBAR+C (application) / ALT+HYPHEN+C (document)
Or press ALT+F4 (application) / CTRL+F4 (document)