Problem with power off computer in Windows 10 - guide to fix it

Problem description:
When power off computer use log out and show start screen but can't power off computer.

Platform:
Windows 10 64-bit

Solutions:
In control panel in "Hardwear and Sound" (polish: Sprzęt i dźwięk) select "Change what the power buttons do" (polish: Zmień działanie przycisków zasilania) and click on: "Change settings that are currently unavailable" (polish: Zmień ustawienia, które są obecnie niedostępne). Uncheck all option. Problem was fixed.