by Eoin Campbell.
Posting this in the hope it may be useful to others. We use Moodle 3.1 with the Essential theme, and have just started investigating the Rubric marking scheme. We have 11 levels in each criterion, so it makes the marking table very wide. By default, when grading assignments, the rubric marking table is too wide to be fully displayed, forcing a lot of horizontal scrolling by graders.
I'm not sure if this is specific to the Essential theme, or generic to Moodle. In any event, I tried a number of workarounds, but what worked best for me is to add some custom CSS to remove the restriction on the maximum width of the box containing the rubric, which was set to 800px.
Go to Site administration > Appearance > Themes > Essential > General and edit the Custom CSS box (at the bottom of the page) . The following line of CSS does the trick (overriding 800px with none:
.path-mod-assign .fullwidth[data-region="grade-panel"] [data-region="grade"] { max-width: none; }