Hi Champ!
Thanks so much for replying. I thought nobody would really care to reply to my problem. Anyway, I ended up stumbling upon the answer accidentally. So, as it happened, the Ultimate member “account” and “login” pages don’t show full width on a desktop, even you set them to that on Elementor. I suppose, because of that, there just wasn’t enough room for WordPress/Elementor to show the header on top because the Ultimate member “account” and “login” pages were too narrow. I ended up switching the sections layout from “Boxed” to “Full width” and—when I did—the header and footer both popped up…haha. So yeah, it works now. Thank you again Champ, your time and attention is much appreciated.