The View menu > Rubber Band Zoom command allows you to zoom in on the section by windowing. To use the command you depress and hold down the left button on your mouse. While keeping the left button depressed, drag your mouse to "rubber band" a window around the portion of the section that you want to zoom in on. The rubber band window that shows the extent you have dragged the mouse appears as a dashed line on your screen. When you release the mouse left button the new view is displayed.