By Sue Chastain
To return your document to 100% magnification, locate the zoom tool in the toolbox and double click the button. The keyboard equivalent to this shortcut is Ctrl-Alt-0 (Win) or Cmd-Option-0 (Mac).
Note that both of these numbers will usually be larger than the final file size of the saved document. That's because Photoshop documents are usually compressed when saved. For more on the Document Sizes display, look up Document Sizes option in the Photoshop Help file.
The "Reveal in Bridge" menu option opens Adobe bridge to the folder where the image resides on your computer.
The "Show" sub-menu allows you to change what is displayed in this area of the status bar. In addition to Document Sizes, you can optionally choose to display other information about Version Cue, the current document, Scratch Sizes, Efficiency, Timing, the name of the current tool, or 32-bit exposure information. You can look up each of these items in Photoshop's online Help for more information.