CVar mapQuestDifficulty

Whether to color quest titles by difficulty in the World Map.

Default Setting

 * 0

Possible Settings

 * 0 :Off
 * 1 :On

Changing this setting
In-game, type the following /console mapQuestDifficulty setting

Alternatively, you can exit wow, open the Config-cache.wtf file, and add the following line: SET mapQuestDifficulty setting