I’ve set the Footer layout for you, please check again. Since your homepage footer layout was set as “No Footer”, so your change in “Appearances > Customize > Footer” couldn’t work.
You’ll need to set up your Footer layout in the page editor first, if “default” => footer layout is getting from “Appearances > Customize > Footer”, otherwise, you can specific Footer layout for page as in the screenshot here: https://ibb.co/3Bxrk48
It’s very simple indeed, just 2 points that you need to know to use our options network.
1. There are global options that affect you entire site (Appearances > Customize).
2. There are individual options that affect only that page or post (at bottom of the page editor as in the screenshot above).
That is how the entire options network works and allows you to build incredibly unique, professional websites as you see here.