Cannot add new Program Enrollment in Education 15.0.0

Can I enroll 1 student to 2 different program?
Because once I enroll 1 student to 1 of the program, for the next program enrollment I cannot find this student name in the list.

Go to Student Detail , you find connection tab in that you can add Program enrollment

Yes, i can do it via Connection tab…
But why I cannot select from Program Enrollment