You have to edit the home page in the WordPress dashboard > Pages > Home > edit in the Page Options find Page as One Page option: https://imgur.com/lB793Sx
Switch the button to on.
About the menu configuration please check the video:
The #div has to be set on the page by adding the same class to the respective sections.
If you can’t finish by yourself send to us your wp creds and online link and we can help you with that.
