Follow the given procedure to select a specific folder sorting option:
Select the Collection from the drop-down present at the top left-hand side of the action bar to view the folders and files under the Collection.
Select the folder (single-click on any folder)
Click on the
(More button) present at the top of the displayed folder tree on the left-hand side of the screen.Once the menu opens up, click Folder sorting option menu item. The following screen appears,
5. Select any one of the options 'Manually organized', 'Alphanumeric' & 'Create date' and then click Save button.
Manually Organized: If you select this radio-button, the folder structure will appear as per the sequence of upload, or sequence of creation within the application. For example, if Folder A, B & C are uploaded one after the other, then the Folder A will appear first in the tree structure and after that folder B & C will appear. Again, if you create a new folder D within the application using the Create Folder function on the Collection Files screen, then that folder will appear after (below) folders A, B & C.
You can select a folder and then use the 
button to move the folders up and down as per your wish. This option only works when the folders sorting option is selected as "Manually organized".
Alphanumeric: If you select this radio-button, the folder structure will appear one after the other according to the alphabetical order of the names of the folder i.e. folders with name starting with letter 'A' will appear first and folders with name starting with letter 'Z' will appear last.
Create Date: If you select this option folders will be sorted as per the date of creation. Folders created first will appear before folders created at later dates.