learning how to restrict viewing all courses of the catalog?

Summary

learning how to restrict viewing all courses of the catalog?

Content

Hello,

In learning , when the learner navigates to Me - Learning 
there is the 'Catalog' section ,where he can select a course from the catalog.
We would like to know how to restrict courses in the system so that no all courses will
be displayed to the learner.

How can we define such a restriction ? 

see attached file. 

Thanks 
Revital