The list view includes a nearly-impossible to see thumbnail (more like pinky nail) image of the design, but more easy-to-view information about the actual file.
The design view option is a grid view that enlarges the thumbnail making it easier to see, but it doesn't include any information about the actual file.
The tool icon with the three boxes and a line next to each, will display the list view. It gives a very small image of the design, but lets you see properties about each files including the name, file type, size, and the category and artist - if you've assigned one.
The icon with the four boxes will give you the grid view in the Silhouette Studio library. While it gives you a larger thumbnail image of the design file, it will not provide any at-a-glance information about the file except the file name.
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