Within Resource Folders, you have the option to view files in either a List or Thumbnail layout.
The Thumbnail view is recommended for images, as it provides a larger preview of the Resource file.
You can change the view at any time, by clicking the Thumbnail layout button in your folder header, as below:
Users with appropriate permissions can also select a Default Layout for a folder by clicking in the Folder Settings icon.
*Note that while a default layout can be set in the folder settings, users can change their individual view while in a folder.