Why do "Standard Controls" players still need to face target but not "Legacy Control"

[Rayinfluense]

I see what is going on. You are turning your camera using the LEFT mouse button. Which makes me want to question how you're playing.

Please answer me this - how do you turn your character when you're walking?

For me, using Legacy controls, turning the camera with right or left mouse button do the same thing: The character turns with the camera. When I use standard controls, right click turns camera and character. Left click turns camera only. I haven't found a way to turn camera only with Legacy controls