Help! The “scroll-able” menu doesn’t work

Hello, I’m using the “Education Business” theme with the “Home 3” layout as child theme from Bizberg, but I have a problem where the sticky menu has a problem so I can’t scroll to the footer. and the sidebar on the “course summary” is too close to the menu, so the header section is closed. How do I fix it? Which part should I change in the theme code? Thank you.