Begin by going to 'Courses' > 'Instructors'.

This will open up as a new tab in 'Site' >'People' > 'Instructors'.

It will provide you with a list of all the instructors in your course.

Click 'Advanced Filter', to choose which instructors you want to see. Then 'Add Filter'.

For example, I want to see instructors 'Enrolled in Course' called "Marketing Made Easy".

Next, 'Apply Filter'.

There is only one instructor listed below that is enrolled on this course.