by Sergio Mazzarelli.
Perhaps you know this already, but I thought I should mention just in case that the problem can be mitigated by using Shift+click so that the submission opens in a new window. If the display is large enough one can resize the windows and have both the submission and the grading and feedback page on screen at the same time. Alternatively, one can use Ctrl+click and choose to open the submission in a new tab, but in that case one has to switch between tabs.