If you want to protect your own cover photo and profile details, follow these steps: Lock your Facebook profile | Facebook Help Center
Facebook’s "Profile Lock" is a robust privacy feature designed to restrict strangers' access to personal content. While it is highly effective at shielding your timeline, users often search for ways to view or download a locked profile's cover photo in full resolution. What is Facebook Profile Lock? fb locked profile cover photo viewer top
: In some cases, if a profile was public before being locked, Google might have cached old public versions of the images. If you want to protect your own cover