• To create a sub-folder, go to the tile in which you want to create sub-folders (NOTES, CARDS, FLASHCARDS).
• Click on the folder icon in the centre of the menu bar at the bottom of the screen. In the window that's displayed on screen click on subfolder.
• Select the folder to which you want to attach your sub-folder,
• Enter the name of the sub-folder,
• Add, if desired, a subfolder colour.
• Click on OK. Your sub-folder has been created.