To build on what Michael C wrote, and based on another post that I came across (https://theme-fusion.com/forums/topic/related-posts-not-showing-on-post-pages/), I was able to put together a solution to this using the Avada Child Theme. I found that disabling Fusion Builder Elements in the Fusion Builder settings did not consistently remove the d…

Avada Theme scripts handler.php

<?php 
add_action( 'wp_enqueue_scripts', 'custom_disable_theme_js' );

function custom_disable_theme_js() {
    Fusion_Dynamic_JS::deregister_script('avada-comments');
    Fusion_Dynamic_JS::deregister_script('avada-general-footer');
    Fusion_Dynamic_JS::deregister_script('avada-mobile-image-hover');
    Fusion_Dynamic_JS::deregister_script('avada-quantity');
    Fusion_Dynamic_JS::deregister_script('avada-scrollspy');
    Fusion_Dynamic_JS::deregister_script('avada-select');
    Fusion_Dynamic_JS::deregister_script('avada-sidebars');
    Fusion_Dynamic_JS::deregister_script('avada-tabs-widget');
    
    Fusion_Dynamic_JS::deregister_script('bootstrap-collapse');
    Fusion_Dynamic_JS::deregister_script('bootstrap-modal');
    Fusion_Dynamic_JS::deregister_script('bootstrap-popover');
    Fusion_Dynamic_JS::deregister_script('bootstrap-scrollspy');
    Fusion_Dynamic_JS::deregister_script('bootstrap-tab');
    Fusion_Dynamic_JS::deregister_script('bootstrap-tooltip');
    Fusion_Dynamic_JS::deregister_script('bootstrap-transition');
    
    Fusion_Dynamic_JS::deregister_script('cssua');
    
    Fusion_Dynamic_JS::deregister_script('fusion-alert');
    Fusion_Dynamic_JS::deregister_script('fusion-blog'); // !
    Fusion_Dynamic_JS::deregister_script('fusion-button'); // !
    Fusion_Dynamic_JS::deregister_script('fusion-carousel');
    Fusion_Dynamic_JS::deregister_script('fusion-chartjs');
    Fusion_Dynamic_JS::deregister_script('fusion-column-bg-image');
    Fusion_Dynamic_JS::deregister_script('fusion-count-down');
    Fusion_Dynamic_JS::deregister_script('fusion-equal-heights');
    Fusion_Dynamic_JS::deregister_script('fusion-flexslider');
    Fusion_Dynamic_JS::deregister_script('fusion-image-before-after');
    Fusion_Dynamic_JS::deregister_script('fusion-lightbox');
    Fusion_Dynamic_JS::deregister_script('fusion-parallax'); // !
    Fusion_Dynamic_JS::deregister_script('fusion-popover');
    Fusion_Dynamic_JS::deregister_script('fusion-recent-posts');
    Fusion_Dynamic_JS::deregister_script('fusion-sharing-box');
    Fusion_Dynamic_JS::deregister_script('fusion-syntax-highlighter');
    Fusion_Dynamic_JS::deregister_script('fusion-title');
    Fusion_Dynamic_JS::deregister_script('fusion-tooltip');
    Fusion_Dynamic_JS::deregister_script('fusion-video-bg');
    Fusion_Dynamic_JS::deregister_script('fusion-video-general');
    Fusion_Dynamic_JS::deregister_script('fusion-waypoints');
    
    Fusion_Dynamic_JS::deregister_script('images-loaded'); // !
    Fusion_Dynamic_JS::deregister_script('isotope'); // !!
    
    Fusion_Dynamic_JS::deregister_script('jquery-appear');
    Fusion_Dynamic_JS::deregister_script('jquery-caroufredsel');
    Fusion_Dynamic_JS::deregister_script('jquery-count-down');
    Fusion_Dynamic_JS::deregister_script('jquery-count-to');
    Fusion_Dynamic_JS::deregister_script('jquery-easy-pie-chart');
    Fusion_Dynamic_JS::deregister_script('jquery-event-move');
    Fusion_Dynamic_JS::deregister_script('jquery-fade'); // !!
    Fusion_Dynamic_JS::deregister_script('jquery-fitvids');
    Fusion_Dynamic_JS::deregister_script('jquery-fusion-maps');
    Fusion_Dynamic_JS::deregister_script('jquery-hover-flow');
    Fusion_Dynamic_JS::deregister_script('jquery-hover-intent');
    Fusion_Dynamic_JS::deregister_script('jquery-infinite-scroll'); // !
    Fusion_Dynamic_JS::deregister_script('jquery-lightbox');
    Fusion_Dynamic_JS::deregister_script('jquery-mousewheel'); // !
    Fusion_Dynamic_JS::deregister_script('jquery-placeholder');
    Fusion_Dynamic_JS::deregister_script('jquery-request-animation-frame');
    Fusion_Dynamic_JS::deregister_script('jquery-sticky-kit');
    Fusion_Dynamic_JS::deregister_script('jquery-to-top');
    Fusion_Dynamic_JS::deregister_script('jquery-touch-swipe'); // !
    Fusion_Dynamic_JS::deregister_script('jquery-waypoints'); // !
    
    Fusion_Dynamic_JS::deregister_script('lazysizes');
    Fusion_Dynamic_JS::deregister_script('packery'); // !!
    Fusion_Dynamic_JS::deregister_script('vimeo-player');  
      

//     Fusion_Dynamic_JS::deregister_script('jquery-easing');      
//     Fusion_Dynamic_JS::deregister_script('modernizr');
//     Fusion_Dynamic_JS::deregister_script('fusion-testimonials');
//     Fusion_Dynamic_JS::deregister_script('jquery-cycle'); // !    
//     Fusion_Dynamic_JS::deregister_script('jquery-flexslider'); // !
    
}