You can zoom in to magnify a picture or zoom out to see more of the picture.
Do one of the following:
To change the magnification level gradually, in Filmstrip or Single Picture view, use the Zoom slider
To view a picture at a specific percentage, in Filmstrip or Single Picture view, on the Standard toolbar, click the arrow next to the Zoom box , and select the setting you want.
Zooming affects how you view the image; it does not change the size of the picture in the file or how it will print.
If you zoom in or out on pictures in Thumbnail view, you will zoom in or out on all pictures at once.