Customizing the Window Matte

  To change your matte features, choose Matte...  from the
  Workspace Options submenu.  The Window Manager
  displays the Matte Options dialog box.

  From this dialog box you can change your matte size and
  color options.

  Additional topics:

  *   Customizing Your Workspace

  *   Customizing Borders

  *   Customizing Border Colors

  *   Customizing Icons

  *   Customizing Icon Colors

  *   Applying Your Changes