Shift+spacebar, I like having a second indicator for direction. You can also lock the mouse to get direct steering but that feels weird to me because sensitivity is then tied directly to your ship’s turn rate.
I mostly fly with flight assist on, but sometimes like in the beginning of that video I’ll turn it off so I can drift at an angle and get a little more time on target. Well that was the idea anyway, almost none of my shots landed there lol.
edit: Forgot to mention, I fly with autoroll off, it’s much easier to maneuver in larger ships by manually rolling. I would also strongly advise against turning adaptive steering on.