Disable “next course” button

Hi,

I use lifter lms and astra theme.
I noticed that users can accsess other courses on my site than the one they are enrolled in.
At the bottom of the coursepage there is two buttons “previous course” and “next course” and if a student clicks on these buttons they get accsess to all my other courses.

How can i restrict student to only accsess the course they are enrolled in?

Thank you.

/Eric