I would like to know in which file and which section of the file contains the configuration of the Procc Display where I get a message on screen which spell has been procc'd. I would like to change the font color and the font size, nothing more.
The Proc display is standard blizzard. As far as I know the only writing that pops up by nUI are cooldowns. You may be able to tweak the proc display with one of the combat text addons that are out there.