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The technique for managing shortcut tiles to Metro-style apps is similar to that used for Windows desktop programs. Swipe down or right-click to expose the app bar options shown here, Click Smaller (or Larger) to change a wide tile to a square one half its size or vice-versa. Both sizes are shown here.
You can also click Pin or Unpin to add or remove a program tile from the Start screen, or click Uninstall to remove the program completely.