Hey @Tcaud, thanks for posting your question and happy new year!
If you want to create folders in your main Dropbox and not within an already existing folder, all you have to do is go to your "all files" page here and click on the "create" button at the top of the page.
Then, choose the "folder" option, to create and name your folder.
I hope this helps, but if you have other questions, let us know!