I tried using the "Hide rubric score total from students" setting in a test rubric attached to an assignment and went through the process of submitting the assignment as a student, then grading it as the teacher to see what the student would see.
When I looked at what the student sees I was surprised to find that I could see the ratings (including the points for each) that the teacher had chosen for that student AND the points the teacher had awarded for each criterion (see attached).
The support resource (How do I add a rubric to an assignment using Enhanced Rubrics? - Instructure Community) says, "Students can still see the point values for each criterion, but the total score will not be shown at the bottom of the rubric." but if I can see the points value AWARDED for each criterion then I can sum them up to get the "total score" and if there is a discrepancy I'll know that the teacher has manually modified the grade.
I redid the above test using the "Use this rubric for assignment grading" setting and the view for the students looked the same so I wondered if there's a bug.
The context for my testing is that sometimes teachers want to grade using a rubric but not show the students the points they awarded for each criterion to discourage students from appealing decisions when they can see they just need an extra point or two. This functionality doesn't seem to be available in Canvas at present.
