Explorer toolbar - File Utility

Folder selector
The drop down list at the left allows you to select the folder currently being viewed.

Up one level
Select this button to move to the next highest level folder.

Create new folder
Press this button to create a new subfolder within the current one. An edit field becomes available allowing you to set the folder's name.

Show Tree
The explorer views can optionally have tree views associated with them - these display mainly folder information. It may be easier to change to a different folder with the tree views showing but you will see more information with them hidden.

Icons
There are four ways to display the icons in the explorer views - Large Icons, Small Icons, List and Detail.