In the subject list screen, you may click on the title of the subject you wish to browse to display the image document.
When there is more than one image, you can go through the images back and forth by clicking "Previous Item " and "Next Item" button （circled by red）. Also, you can zoom in and out the entire image, enlarge the selected area, move the image with the mouse dragging.

（a）Displaying in thumbnail format （Windows only）
You can view the complete picture of the image displayed at the left side of the screen （circled by red） in the small window （thumbnail） by the steps below.
Right click on the image > "Layout" > "Thumbnail" （circled by blue）