Are you allowed in this situation to change the lane you are occupying?

Why?

The lanes are separated by a broken line, so changing lanes is permitted. The white arrow crossed out with yellow lines no longer applies. Before moving over, signal, check that it is safe and give way to vehicles already in the lane you intend to enter.

§ 85 ust. 3 i § 86 ust. 1 rozporządzenia w sprawie znaków i sygnałów drogowych; art. 22 ust. 1, 4 i 5 Prawa o ruchu drogowym