In the View Module you will see the Zoom In and Zoom Out options.
Click Zoom In to focus on a specific part of your document. The Zoom Out option will allow you to see more of your document at once
In the bottom right hand corner you will see a bar with a + sign on one and a – sign on the other. The Percentage next to the + Sign indicates the current level of magnification. When the document is at 100% it will be the actual document size. You may move the cursor along this bar to modify the zoom level. You can also click on the + or – signs to change the magnification.