Add me to the list of inquiring minds that want to know how to change the grading column display set:
When I (painstakingly) minimize the unwanted columns, that setting is retained for my login session. But a new login produces the fully-open display of all columns. This is especially irritating because the browser is apparently not loading all the cells of the table--there is no horizontal scrollbar (Should this itself be a tracker issue?).
Perhaps a course-level administrator could define a set of columns to display;
or a checkbox could allow any user to fix the currently-maximized (or -minimized) set of columns to persist across login sessions (i.e. set a flag for this course, for this user).
Or a sysadmin could minimize certain columns by default, for all courses in a domain (then I would have to appeal to my sysadmin).
We are running v2.7, displayed on MacOS, tested with both firefox and chrome.