If you use a file or folder frequently, you can add it to your favorites for quick access. Your favorite items are shown in the Files list in the side panel and in the Favorite Items dashboard widget (if you have added it to your dashboard).
Click Files in the side panel. (If Files is not shown, see Customize the Side Panel for details on how to add it.)
To mark a file or folder as a favorite, click 
beside the item. The star turns yellow 
to indicate that the file or folder is now a favorite.
To remove an item from your favorites, click 
beside the item in the File list or in the side panel. The star turns grey 
to indicate that the file or folder is not a favorite.