Delete sample courses

Hello,

I have sample pages live and indexed by Google on my website with Tutor LMS. There no more samples courses in my dashboard, nor in the database. I can’t find the way to delete those pages (like https://www.methode-harmonica.fr/courses/wordpress-master-class-for-beginners/lesson/about-animations/).

The page I need help with: [log in to see the link]