WP Floating Menu is a FREE WordPress plugin that makes your WordPress website’s usability with one page navigator menu or sticky navigation menu.
You don’t need to change your WordPress theme to make your website work like One Page website, just use this plugin to add one page scrolling navigation to any well coded WordPress themes / website.
You need to define different sections on your website page, then create/define one page navigation menu with them in just minutes.
Apart from One page navigation, you can create sticky menu and place in different location on your website for easy / smart navigation.
Details Page: https://accesspressthemes.com/wordpress-plugins/wp-floating-menu/
Documentation Link: https://accesspressthemes.com/documentation/wp-floating-menu/
Plugin Demo: http://demo.accesspressthemes.com/wordpress-plugins/wp-floating-menu/
Download Page Link: https://wordpress.org/plugins/wp-floating-menu/