Currently in Code Editor, you need to add folders and files simultaneously. This is because folders must contain at least one folder or file.
First, find the folder you want to add a new folder to and right click. You'll see the option to "Create File". Click this:
Next, the modal will give you a place to input the Filepath for your new file. You will see the current Path for the parent folder you selected.
You need to add to that path with folders you'd like to contain your file and follow each with forward slashes e.g.
new_folder_1/new_folder_2/ . You'll then need to add the name of one of the Files you'd like to add inside the folder e.g.
Remember the file extension!
This will create the folders and the file together. You can then add further folders and files inside your new folders.