CVar deselectOnClick

Clear the target when clicking on terrain - ie 'Sticky Targetting'

Default Setting

 * 0

Possible Settings

 * 0 :Off
 * 1 :On

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

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