Does my résumé have to be 1 page? I'm getting mixed direction

You will get man perspectives on this answer. My recommendation is to make your résumé "experience-appropriate." If you have a few decades of experience, two-to-three pages are fine.  Regardless of what you do, some companies and recruiters may request a one-page résumé. So, I recommend everyone have a one-page version on hand. Import your longer version of your résumé to LinkedIn, word for word. You want all of those juicy keywords, key phrases, skill words, and results on LinkedIn so you can be found by recruiters.