This mode appears in case you are learning a language with articles, separate verb infinitives or other additional, but isolated word particles.
If you enable this mode, you will be required to write all the articles along with the words. If you don't, they will be filled in automatically.
If you want to learn the articles:
1. Tap on the "More" tab.
2. Tap on the "Settings" menu option.
3. Tap on "Course Settings".
4. Enable the "Articles" mode.