I’m sharing in-case anyone else comes up with the same problem. All we needed was to show the Module overall total to 2 decimal places.
However, Moodle has quite a few different places you think it might be set. It is not in the Grader > Course Grade Settings. It is not in Grader > My report preferences > Grader Report.
Turn editing on and go to the Grader Report page, at the top of the table is a title of the report, similar to this “WM102:Electrical and …”
Click on the Cog / Settings icon just under it, and in there is the “Category Total > Overall decimal points”
This then changes the Overall module total to be to 2 decimal places.