You can resize (enlarge or reduce) a page displayed in the image view or text view.
Click in the view you want to enlarge or reduce to make it active.
Click the zoom in or zoom out button in the Image toolbar.
Or, choose Zoom in the View menu and select a size option in the drop-down list.
The page resizes as specified.
TIP: You can also click your right mouse button in the view you want to resize and select a size option in the shortcut menu.