Are all xenon headlamp units switchable for continental driving?

With the continent, I assume you refer to European continent as opposed to the islands GB. Some of the E-labled headlamps are switcheable LHD/RHD, but not all. If they are switchable, they will have a special extra label besides E-label on front glass, I think I even put that into the FAQ somewhere. Some switchable headlights are compromises, meaning that it does not perform as well in both modees.