There are a number of Zoom buttons available for changing the screen view on the Cut Preview Screen.

Use Zoom Window to Zoom into a specified area of the screen. 

Click the Zoom Window button. 

Draw a box around the desired area on the screen. 

The screen zooms in to that area.

Zoom In about 50% on the screen.

Click the Zoom In button. 

The screen zooms in about 50%. 

Zoom Out about 50% on the screen.

Click the Zoom Out button. 

The screen zooms out about 50% unless the screen is already at the full screen view.  

Zoom All to view the entire screen.

Click the Zoom All button.

The entire drawing zooms out to the full screen view.