When you uncheck it, you should set the minimum score to 0.
Students can check the rubric evaluation criterion in advance in 'Submission Status > Grading Criteria'. (Student screen: see below)
When the instructor evaluates the assignment, the rubric description and the score for each level are displayed. (Professor screen: see below)
Students can check the rubric description and scores for each level in 'Submission Status > Grading Criterion' and 'Feedback > Grade'. (Student screen: see below)
When the instructor evaluates the assignment, you can enter comments about the criterion. (Professor screen: see below)
Students can check comments on the criterion entered by the instructor in "Assignment Grading Results > Grades". (Student screen: see below)