After turning left, do the signs on the crosswise roadway prohibit you from going to the right uttermost lane?

In the video you are approaching a large junction in the left-turn lane - on your approach, between the lanes, there is an area closed to traffic - and on the crossing roadway that you intend to enter, the lanes are separated by broken lines P-1. This marking does not prohibit you from moving into the far right lane after the turn. The answer is: no.

The Regulation on road signs and signals states that the single broken line P-1 marks out traffic lanes and does not prohibit crossing it; only a solid line P-2 or a double solid line P-4 would mean a ban on crossing. However, the Road Traffic Act requires you to signal a lane change with your indicator and to give way to a vehicle travelling in the lane you are moving into. After the turn you enter the lane that corresponds to the one you turned from, and you move across to the right lane only after checking your mirror.

Legal basis: § 86 para. 1, 3 and 5 of the Regulation on road signs and signals; Art. 22 para. 1, 4 and 5 of the Road Traffic Act (Prawo o ruchu drogowym)