No none of my courses are hidden and I have turn off and on audience-based visibility in advance feature in my testing  but nothing happen. Even I have remove enrolled audience group from course setting and nothing happen. 

Mainly want to know , why some course show completion of other courses(course list) and some course doesn't shown completion of other courses (no course list) in course completion .

Please look back previous attachments for more understanding 

Regards 

Rahul