While delivering your presentation and using presenter view, you can magnify part of the slide on the screen.
In the lower right-hand corner of your slide, click Slide Show view.
In the lower left corner of the presenter view, click the magnifying glass icon.
In presenter view, a bright rectangle appears on the slide, and the mouse pointer changes to a hand.
Point your mouse over the area of the slide that you want to magnify, then click to zoom in on-screen.
In presenter view, the mouse pointer becomes a hand to indicate that you can click and drag to move the zoom effect to a different area of the slide.
To turn off the Zoom effect, press the Esc key or click the magnifying glass icon again.
The on-screen slide zoom back out to standard view.