Learn theme - hide sub item from menu and change color scheme for code

Beginner questions: I want to use hugo for writing a tutorial (will contain 200+ pages) and the Learn theme seem to work for what I want to do. I’ve got two questions

  • Is it possible to hide a page from the menu in the sidebar? The site it going contain a lot of exercises and I don’t want them in the side bar.

  • How do I change the color scheme for the code section? I find light on dark hard on my eyes and want to change, I looked at the docs for Learn but couldn’t figure out how to do that.