I was unable to type “BRN” into the class prefix field when I started this chapter/project. I still was able to complete everything fine, but would anyone know why I’d be unable to change the class prefix?
I am having the exact same problem…not able to modify the prefix.
you can still click within the prefix textbox and type, even though it is shaded light grey with existing characters!
When you type BRN or whatever you want to put in there it will override the existing values.