i think there is now a filter
try:

add_filter('avf_show_tags_meta', 'show_tags_on_blog_posts');
function show_tags_on_blog_posts(){
	return true;
}

function new_avf_postslider_posts_meta_data_show(){
	return true;
}
add_filter('avf_postslider_posts_meta_data_show', 'new_avf_postslider_posts_meta_data_show');

last one is for grid style.
See: https://kriesi.at/documentation/enfold/blog-post/#display-post-tags-on-blog-posts-element

See first if this is a nearby solution: https://enfold.webers-webdesign.de/

ok – here is a quick solution (with AI support).
Enfold has the hook where you can insert something directly after the body opening tag. So put this to your child-theme functions.php:

function ava_custom_jalousie_loader() {
?>
<script type="text/javascript">
	window.addEventListener('load', function() {
		document.body.classList.add('loaded');
	});
</script>
<?php
}
add_action( 'wp_footer', 'ava_custom_jalousie_loader' );

add_action('ava_after_body_opening_tag', function() {
  echo '<div id="preloader-wrapper">';
    echo '<div id="jalousie-preloader">';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
		echo '<div class="jalousie-slat"></div>';
    echo '</div>';
  echo '</div>';
});

if you want less amount of jalousie-slat – remove some divs

now the css:

#preloader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    perspective: 1000px;
    overflow: hidden;
}

#jalousie-preloader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: transparent;
    transform-style: preserve-3d;
}

.jalousie-slat {
    width: 140%;
    position: relative;
    left: -20%;
    flex-grow: 1;
    background-color: #222222;  /* === change to your color you like === */
    transform-origin: 50% 50%;
    transition: transform 0.8s linear, opacity 0.4s linear 0.4s; 
    backface-visibility: hidden;
    transform: rotateX(0deg);
    opacity: 1;
    box-sizing: border-box;
}

body.loaded #preloader-wrapper {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s 0.8s, visibility 0.3s 0.8s;
}

body.loaded #jalousie-preloader .jalousie-slat {
    transform: rotateX(90deg) scaleY(0.01);
    opacity: 0;
}