Learning how can we remove or end date an offering of a course?

Summary

Learning how can we remove or end date an offering of a course?

Content

Hello,

We have a course , with 2 offering .we would like to remove one of the offering . since we are using a specialization , and we would like only 1 offering per a course (otherwise the learner has an option to enroll which we dont want).

How can we remove the offering of a course ? 
I see the offering has a 'offering end date' but i couldn't manage with 'Edit' to either remove or inactivate the offering . one of the offerings .

Please see attached screenshot.

Thanks 
Revital