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Hi there,

Give this a shot:

add_filter( 'register_post_type_args', function( $args, $post_type ) {
    if ( 'wp_show_posts' !== $post_type ) {
        return $args;
     }

    $args['capability_type'] = 'manage_options';

    return $args;
}, 10, 2 );

Adding PHP: https://docs.wpshowposts.com/article/adding-php/

Let me know 🙂