Question How to change header on one page back

[atleastdesign]

I'm using one of Astra's theme choices. It has a primary menu/header that lies on the top section of every page. On all my pages the top section background is an image and the menu is placed over the image/background, but I realized that on one of my pages I accidentally changed the menu to appear above the section in a white bar. The revision history no longer contains the correct version. I'm not sure what I did. Thoughts? I'd like to change it back, remove the white bar, and have the menu lie on top of the top section.