Hi
To change color to red for the Note prefix text (Concept topics):
1. Go to app > technicalContent > template
2. Open concept.template (first make copy of original)
3. Press ctrl + D to open character designer
4. In the Character Tag drop down, select note.type
5. Change color to red.
6. Save, you may have to save to some other directory than C: then move copy to the template folder and replace.
For other topics types, same procedure but different topic type.
Best regards