Taxonomie for pages -> colums for pages in archives

Hello again,

i read a lot in the forum and found a lot of helpful stuff, but not exactly what I am looking for.
My website is based mostly on pages and because there are so many of them I want to add categorys and tags to them. I did this via adding this in the functions.php:

function add_taxonomies_to_pages() {
 register_taxonomy_for_object_type( 'post_tag', 'page' );
 register_taxonomy_for_object_type( 'category', 'page' );
 }
add_action( 'init', 'add_taxonomies_to_pages' );
 if ( ! is_admin() ) {
 add_action( 'pre_get_posts', 'category_and_tag_archives' );
 
 }
function category_and_tag_archives( $wp_query ) {
$my_post_array = array('post','page');
 
 if ( $wp_query->get( 'category_name' ) || $wp_query->get( 'cat' ) )
 $wp_query->set( 'post_type', $my_post_array );
 
 if ( $wp_query->get( 'tag' ) )
 $wp_query->set( 'post_type', $my_post_array );
}

Works perfect. - But now I can´t give the pages-previews in the archives-page the same design as the posts. (see here -> https://www.ffcorner.com/testwp/tag/tifa/ First Entry is a post, the next are pages)

I tried it with css and with the Colums to custom post types filter -> https://docs.generatepress.com/article/using-columns-in-the-blog/#adding-columns-to-your-custom-post-type
but I could´t get it to work.

I didn´t want to try the WPSP, because I´ve read that there will be no more updates and that it is coming with the new GenerateBLock version. Should I wait for this or is there any other way I can go for now?

Thank you!