On the tool bar you see three solid round buttons in silver, green, and red. The silver button gives you the actual size view of PDF document. The green one offers you Fit Page view. The red one switches to the Fit Width view, which is the default view mode. In the Pro version another view is added namely Continuous View, which loads PDF files 3x faster.
Hotkeys on the keyboard for different views,
F1 - Continuous View (only available in PDF Reader Pro version)
F2 - Fit Width
F3 - Fit Page
F4 - Actual Size
