In order to organize your files, they can be placed in folders. Creating a new folder can be done in two ways:
Right-click an element in the Navigation Area | New | Folder ()
or File | New | Folder ()
If a folder is selected in the Navigation Area when adding a new folder, the new folder is added at the bottom of this folder. If an element is selected, the new folder is added right above that element.
You can move the folder manually by selecting it and dragging it to the desired destination.