Note: This option is only available for the Windows 10-anniversary version. Your display should be black though the black ground image shall remain the same at most times. You now have a very own dark-themed look. Here you would have two options: Light and Dark. Go down till you see the “ choose you app mode” option.
All you need to do is follow the steps below and get one working like charm: How to Switch Windows 10 Into Dark Mode Without a Theme
How to Switch Windows 10 Into Dark Mode Without a Theme.
