These global preferences provide control over several aspects of your account. Under "Preferred Name Formatting," you may change the parts of your name which should be displayed to you and other users. "Start Page Width" allows you to specify the usual width of your browser window, in case you want to narrow or widen the display of your start page. If "File View" is set to Expert, you can create files of a greater variety of types and file extensions of known types will not be hidden.