Re-Direct ALL Users to the Home Page IF not logged in

Perhaps something like this?

add_action( 'template_redirect', 'not_logged_in_redirect_home' );
add_action( 'do_feed', 'not_logged_in_redirect_home' );
function not_logged_in_redirect_home(){

    if ( is_user_logged_in() ){

        return false;

    }

    if ( 
        ! is_home() // use this option if you show blogs posts on the home page
        // ! is_front_page() // use this if you show a static page
    ){

        wp_redirect( home_url() );

        exit;
    }
}

Check the documentation on is_home() – https://developer.wordpress.org/reference/functions/is_home/

Since WordPress 2.1, when the static front page functionality was introduced, the blog posts index and site front page have been treated as two different query contexts, with is_home() applying to the blog posts index, and is_front_page() applying to the site front page

So, you might need to use is_front_page() – depending on your setup.

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