I'm just an inattentive fool, and even asked my programmer friend to help me, he fixed everything, and it turns out the answer was at the very top and it was necessary to disable "UI with multiple windows" as described in the program.
In short! Kacper! You are a genius of extensions! Can you recommend some other authors as good as you? And what do you use yourself?
Maybe SpriteMancer, or Fluid Fx or something similar?