Delete previous and next entry

Hello! Please help me to delete from all records: The previous and the next record.
The method below did not help:

add_action('wp', 'pagination_callback');
function pagination_callback(){
    $category_name = get_the_category(get_the_ID());
    if( $category_name[0]->name === 'novosti' ){ 
        add_filter('astra_single_post_navigation_enabled', '__return_false' );
    }
}

from the article: https://www.ads-software.com/support/topic/how-to-remove-previous-post-and-next-post-link-from-specific-post-category/

The page I need help with: [log in to see the link]