In the Extemp app, click on the Folder Management button, located above the folder list. This will open a dropdown menu with different folder management options, select Edit Folder(s) and Subfolder(s).
In the open window select the folder (or subfolder) that you want to edit.
The options to editing a folder are: editing the name, the category, or converting it to a subfolder.
Note: If the folder you are converting to subfolder has its own subfolders, they will be merged.
he options to editing a folder are: editing the name, changing the parent folder, or converting it to a folder.