More choices! You can customize which size the thumbnails are in the display section. You get two picks, large and small. But first, to get there.
The small thumbnails will display 24 thumbnails on the screen.
Lots of options, but not a lot of details. Alternatively, you can set the thumbnails to display in a large size.
Less options but easier to see the details in your options. So large or small, pick how you want your thumbnails to display.