There are a number of controls and breadcrumbs that determine the display of the Resources tool, making it easier to maneuver about within the tool.
Select the Resources tool from the Tool Menu of your site.
Clicking on the name of any folder will isolate the display to just the contents of that folder.
Folders with content will display a solid folder icon. Clicking a solid closed folder will open a folder, within the view of all of the folders. Clicking a solid open folder will close a folder.
Clicking Expand All will open up and display the contents of all folders and subfolders. Clicking Collapse All will close all folders and subfolders.
Expand All / Collapse All is a toggle button. Clicking it once will expand the display; clicking it again will collapse the display.