Hi,
It is possible that the instructor can only view his courses. What is existing now, the instructor can see all the courses directory. And if the answer is no, is there any intention to add this possibility?
This is not available by default. But it is possible. If you use WPLMS Batches, then create a batch for each instructor. Add all instructor courses in that batch. And enable batch exclusivity.
But the instructor can simply create another account to see courses from other isntructors. Or logout and check the site.