Here is a guide on how to disable certification for any of your courses.

Disable certification for a course

Go to Course Setup > Advanced > Miscellaneous Settings in your course and untick the "Enable certifications through OpenLearning".

Please note that this will hide the Credentials menu from the left-side navigation bar.

How do I hide the Certificate of Completion Section on the Course Landing Page (Optional)

Once the certification is disabled in your course, you should also hide the certificate of completion section or supporting document on your course landing page.

To hide this section, go to Course Promo > Landing Page > Display settings section and tick the "Hide grey box" checkbox.