As you work with different areas of the interface, you will notice that you can make the thumbnails larger or smaller. You can perform other tasks with Media Center views too, such as showing taskbar notifications (in the Startup And Window Behavior, Settings menu) and changing color schemes or video background colors (in the Visual And Sound Effects, Settings menu).
Here are a few more views to consider customizing:
Pictures. Click Settings, and click Pictures. This is where you can choose whether to show pictures in random order, in subfolders, and with captions. You can also choose when and where ...