Select Projects while on the Dashboard.
Now to add a new folder, just click the + button.
Next, give your folder a name and hit enter.
Click the ⋮ button.
Moving Files/Project Designs to a Folder
Click Home folder which is where you can find all your projects designs.
Click the ⋮ button on the bottom right of each design project. Then, select Move.
Then select which folder you'd like to move it to.