Cannot figure out how to unhide section in header

Hi,

I'm new to Divi and I made a gaffe.

I inherited a website and needed to modify the header on only one page out of the global template. I hid one section using "display:none;" However, now I need to display this section as the requirements for the layout of this page changed.

Unfortunately, I can't figure out how I disabled the section. I tried searching the Custom CSS tabs in the section, column, and row for the section, along with the Custom CSS for the page and also the site. I also checked the Visibility tab and ensured that everything seemed fine there.

I'm fairly sure I used hand-written CSS, but I'm not 100% sure, as I edited the page a few weeks back and don't have any memory of how I modified the header.

Can anyone advise me on how I can figure out how to either re-add the header to this page or find the CSS selector and property in the Builder?

Many thanks in advance to anyone who has an answer.