There are plenty of cases where the PDF annotation tool has no reason to be used, yet with the new grader there is no way to disable it - it always takes a considerable amount of screen real estate, increases loading time, and increases server load.

I'm teaching a course where the students are submitting zipped code projects and we use a marking guide. The new interface takes up such a huge amount of space that we don't use, it makes it hard to use the marking guide. Even if there was a session sticky way to hide it (an X to click, or a way to collapse it), that would be a big usability win for workflows that don't conform to the narrow pattern this seems to be designed for.