On the New Form layout is there a way to show :
OK, I learned something, so thank you for the question.
On Legacy forms the default behaviour is to show the built-in fields. But on new style forms it's the opposite. But to enable the display of the built-in fields you go to the settings for the form which looks like a little abacus to me at the top right and then while you're in form edit mode look for that same icon again towards the top middle and there will be a checkbox to "Show built-in fields"
I just learned the answer Mark gave yesterday. I was watching video by Juiced about new forms where Matt pointed it out. I was manually adding these fields to my new forms, which is all right, but I prefer using this preference. I recommend the video, it is basic on covering both form types, but it is a good review.