1. Go to the Plans section and head to the folders located on the upper-left corner. Then click on the dotted line of the folder you want to move.
2. Drag the folder and drop it where you need to. If you want to move it as parent folder, drop it closer to the left edge of the screen.
3. Your folder has been moved as parent.
4. Optional: If you want to move your folder as child, drop it a little bit to the right, below the desired parent folder.
4.1 Your folder has been moved as child.