Elsevier's confusing guide for authors
Different fields have different conventions. I am a mathematician, and my advice reflects what I know about publishing conventions in that field. So please take this advice with a grain of salt.
This said: Echoing the comments of m123, sleepy, and Lewian, I would advise you to ignore Elsevier's guidelines entirely. Submit your document in any format which looks attractive, is normal for your field, and is convenient for you to prepare.
You can worry about their guidelines once your paper is accepted, and maybe not even then. My own opinion is that if Elsevier charges $4,034.00 for an annual subscription to this journal, then perhaps they can afford to employ staff to do their own formatting work.