Yeah, when I'm well in training with a language, there's certainly a magnitude more stuff that I know off the top of my head, but what really makes the difference is that I know where to look up how to do something and what libraries to pull in.

You don't need to remember everything to the point, where you could reproduce it without looking anything up. It's much more important to have a pattern in your head, so that when you do look things up, you can piece back together how it worked from that information you find online.