How to Zoom In and Out in a PowerPoint 2007 Slide
Enlarge or shrink PowerPoint slides and preserve your eyes. PowerPoint’s Zoom controls are located in the lower-right corner of the PowerPoint screen and on the View tab. The Zoom box tells you at what percentage you’re currently viewing slides.
The flowing Zoom controls are available:
Zoom dialog box: Click the Zoom box (the % listing) to display the Zoom dialog box, and then select an option button or enter a Percent measurement. You can also open the Zoom dialog box by starting on the View tab and clicking the Zoom button.
Zoom slider: Drag the Zoom slider left to shrink or right to enlarge slides. Click the Zoom In or Zoom Out button to zoom in or out by 10-percent increments.
Fit Slide to Current Window button: Click this button (in Normal view) to make the slide just large enough to fit in the window. You can also find the Fit to Window button on the View tab.
If your mouse has a wheel, you can hold down the Ctrl key and spin the wheel to quickly zoom in or out.