Do all Elsevier journals require ONE column format for manuscripts to be reviewed?
In mathematics, usually authors aren't expected to format their paper according to the journal's template until after the paper is accepted. Even then, authors usually don't bother and leave it up to copyeditors. This is the case for Elsevier as well as other publishers. Although publishers' websites often "encourage" authors to format submissions in a certain way, these suggestions are typically ignored.

What is true for math might not be true for optics, so it is probably worthwhile to ask a scientist with firsthand knowledge of the journal (or at least the research field in general). Perhaps such a person will answer your question here. Otherwise, I would suggest that you only invest any effort into reformatting your paper if such a scientist (not an Elsevier employee) confirms that this is indeed important. If it's not practical to ask a colleague, you might e-mail a member of the journal's editorial board with this question.