It is possible to change the colour however when you create a new GradeBook it will revert to the default colours. I will submit a feature request for you.
To manually change the colours on 1 GradeBook you can highlight the performance cells then go to menu item:
It is possible to change the colour however when you create a new GradeBook it will revert to the default colours. I will submit a feature request for you.
To manually change the colours on 1 GradeBook you can highlight the performance cells then go to menu item:
Format > Conditional formatting.