Remove Block Editor for Post Type

add_filter('use_block_editor_for_post_type', 'bena_disable_gutenberg', 10, 2);
function bena_disable_gutenberg($gutenberg_filter, $post_type) {
    if ($post_type === 'portfolio' || $post_type === 'website-clients' ) return false;
    return $gutenberg_filter;
}