I'm watching a tutorial, and the author made his sphere metallic in Look Dev mode and it shows. I do the same thing and it turns black no matter what I do, whether I turn on scene world or lights or keep them off (his are off).
Here are pictures of his screen: First, he turns the background all the way down;
Then he makes his ball metallic.
Here is what happens to mine:
Why is his Look Dev mode options different from mine, and why is mine black?