As is being discussed with you in our support desk, something like below in your child theme functions.php file to utilize the filter hooks provided would help –
add_filter('lae_posts_carousel_2c2cee9_query_args', 'ocean_modify_posts_carousel_query', 10, 2);
function ocean_modify_posts_carousel_query($query_args, $settings) {
// exclude post 1234 - your post id is numeric see here - https://kinsta.com/knowledgebase/wordpress-get-post-id/
$query_args['post__not_in'] => array('123');
return $query_args;
}
Pls note the 2c2cee9 is the id for the elementor widget obtained by viewing the source of the page in the developer tools.