Changing the image size when viewing a document
If the image of a document is either too small to view or too large to see at on the screen without scrolling, you can change its size. To do so, open the document, click on the "Image" tab, and then change the scale of the image. You can zoom in or out, change the size of the file's percentage, see its actual size, fit to width or fit to window. Here is a picture of the actual toolbar and the sections mentioned.