With Dendron you organize your notes within hierarchies, not folders. There are several reasons, but one that makes sense is that a file can serve as both a file and a folder, whereas a folder can only serve as a folder. See more details here: https://wiki.dendron.so/notes/683740e3-70ce-4a47-a1f4-1f140e80b558.html#will-dendron-ever-support-folders