Of course. If all the courses that you are going to offer on your training platform are free, you can activate the option "Free courses" in the section of your backoffice Configuration> Ecommerce.

Now in your school you will see that the price of the courses or the shopping cart no longer appears and with that the purchase process disappears. When your users register for a course, they will be able to directly access the material.

There is no possibility of removing the shopping gateway for platforms that offer free and paid courses at the same time.