I have also posted in the topic that Rajneel linked but I will post here as well. I agree this would be a great feature to add to moodle. The assignment marking page can be a bit of a nightmare to navigate. Ranjeel's solution posted in the the other topic requires a certain degree of programing knowledge (of which I have none). There were also other solutions posted which used CSS to hide columns (this method isn't effective for me as the columns change depending on whether your assignment allows online text submissions and/or online file submissions).
I also started another topic about the assignment grading page, (which has zero replies currently) on the width of the online text column changing randomly from assignment to assignment.
Generally speaking it would be a nice feature to have more control over this page or a set of explicit instructions for a non programer like myself to implement Rajneel's solution in the other topic.