Testing how to get to speedgrader, I found 3 ways to get to it.
1) from the gradebook, you can click on the 3 dot More menu and it's available there.
2) from the gradebook, click on the name of the quiz. It opens in the more traditional view of a quiz. The Speedgrader button will be on the right, and Edit Assignment Settings.
3) when viewing a student's submission from the gradebook, or by clicking on the grade in the Context card, you can click on the quiz name in breadcrumbs at the top and you get the same view as from method 2).
The view with speedgrader button should be the only view, that's my opinion. It's awkward to have to go through Edit Settings to get to build (and moderate), as is necessary when getting to the quiz from modules, quizzes and assignments,
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