You totally fixed me. For the others that may be reading this thread, I never would have thought to look on the ACTUAL PAGE that I was editing for this setting. I was sure it was a theme setting in like “Header” or “General Styling”, or even css that may have needed to be added. But no. As Sarah pointed out, the setting is in the right side bar towards the bottom. Header visibility and transparency is “Header is invisible and appears once the user scrolls down”.

Many thanks!