These two sections of the website I'm building, a header and a footer, are not visible at all in the code editor. I do not know where they came from or how to remove them. They are not visible in the visual block editor either.

Wanted to move back to wordpress from wix because the wix site editor was pmo. But now wordpress, which I used to think was easy to use, is now betraying me. Please advise kindly. I am not generally a computer person but I built a working blog website with wordpress years ago. Trying to replicate that success now but it's really confusing me.