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It is necessary to return the panel back. I did through

Отладка->Параматры->Отладка->Общие->Показать средства среды выполнения в приложении 

did not help

1 answer 1

Path in English:

Options → Debugging → General → Enable UI Debugging Tools for XAML → Show runtime tools in application

enter image description here

  • I already did it, and in English it didn’t get better - Mikola Mirchuk
  • I apologize, did not notice that your path is not different from mine. Very strange that does not work. Because I have just done this procedure and depending on whether there is a check mark or not, respectively, this black panel is either shown or not. There is a similar article in English: stackoverflow.com/questions/36468509/… - alladuh