How do I edit the "new case / Create case" page layout

I am new to Lightning admin,  I have many case record types.  I have updated all page layouts for all the record types Only thing left that I can not find out how to do is update the page users get when they are creating a new  case.

There are some fields that should Not be on the "New Case" page layout even if they should be on the case page layout -   I know how to do this in classic but so far have not found a way around it in Lightning