As always when working with such small detailed areas, it's recommended to zoom in on your problematic areas as much as possible. The Zoom Out and Zoom In buttons allow you to increase or decrease your view each time you click. You can also zoom down to see the entire image by clicking the Fit Image to Window button then zoom to 100% by clicking the Zoom Image to 100%.
The Navigate button, when clicked, displays the entire image so that you can define the specific area you want to see in the Before and After windows. Drag the supplied rectangle inside the window to the area you want to zoom in on, as shown in the example.