The target casting bar is directly below the self casting bar in the same window. In the Game Options window (Alt+O) go to User Interface >> Targeting Windows >> Casting Bars. If everything is unchecked there, the bar won't display enemy casts.
While in game, you can display a "ghost" sample image of both Casting bars to assist with placement on your game screen. From the Casting bar page of the Window Manager, check Show casting bar sample while not in combat. To hide the sample you can uncheck the box or wait until the next spell is cast.
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