Most of the file and folder organisation is dictated by the Poser library set up, though if you aren't going to use Poser you can move items and folders between libraries (for example, take the Victoria 3 folders from Runtimelibrariespose and put them in a subfolder of RuntimelibrariescharacterDAZ people (or rename the DAZ People folder to Victoria 3).

Do you have a Poser, as well as a DAZ|Studio, content folder set up? It will appear in your Content palette with aplain icon (unlike the stylised S on the DAZ|Studio content folders) and will have sub-folders with special icons for some or all of the Poser library categories.