@judy_harmon I discovered something along these lines as well. A teacher enquired why her students could see their grades even though it was showing on Speedgrader that the assignment was hidden. When I acted as the student however, the grade was visible and the hidden eye icon not visible. When in the Gradebook in teacher view, and I hit the 3 dots alongside the assignment, Canvas let me hide the assignment a second time. When I acted as the student this time, the grades had disappeared and the hidden eye icon was now visible.
Not sure if we should make a science out of this, but it would seem on the face of it that the process has to be done twice to hide grades for Turnitin assignments.
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