I dont think xenon headlamp beam can be focused. If you look carefully you'll notice that the beam is spread widely. One thing you can do is lower the beam by adjusting it from inside the headlamp assembly(theres a mechanism inside).
The OE xenon lights on most cars have a projector lens to focus the beam. Aftermarket xenons with projector lens are available online. Without projector lens, the blinding effect is definitely gonna be there.
Happy flashin(lights) while tailg8in!