I looked through the Canvas guides about muted grades. When I go to the assignment in question (new quiz) and click on the 3 dots as I've always done, the only option that comes up is "sort". There is not crossed out eye on the assignment to indicate that it is muted, but students said they were unable to see their grade. When I go to each individual students page, it is there that I see the assignment is not visible. What have I done to create that, and how can I fix it?