In this situation, can you continue driving in the left lane if the right lane is free?

Why?

The lane you are using has a left-turn arrow. When preparing to turn left, you may continue in this lane even if the right-hand lane is clear.

art. 22 ust. 2 pkt 2 Prawa o ruchu drogowym; P-8b „strzałka kierunkowa do skręcania”