filter by taxonomies in admin

filter-taxonomies.php

<?php
////////////////////////////
    //
    //  Filter Music admin colums 
    //  by artist and genre
    //
    ///////////////////////////
    function filter_cars_by_taxonomies( $post_type, $which ) {
        
        // Apply this only on a specific post type
        if ( 'music' !== $post_type )
            return;
    
        // A list of taxonomy slugs to filter by
        $taxonomies = array( 'artist', 'genre' );
    
        foreach ( $taxonomies as $taxonomy_slug ) {
    
            // Retrieve taxonomy data
            $taxonomy_obj = get_taxonomy( $taxonomy_slug );
            $taxonomy_name = $taxonomy_obj->labels->name;
    
            // Retrieve taxonomy terms
            $terms = get_terms( $taxonomy_slug );
    
            // Display filter HTML
            echo "<select name='{$taxonomy_slug}' id='{$taxonomy_slug}' class='postform'>";
            echo '<option value="">' . sprintf( esc_html__( 'Show All %s', 'text_domain' ), $taxonomy_name ) . '</option>';
            foreach ( $terms as $term ) {
                printf(
                    '<option value="%1$s" %2$s>%3$s (%4$s)</option>',
                    $term->slug,
                    ( ( isset( $_GET[$taxonomy_slug] ) && ( $_GET[$taxonomy_slug] == $term->slug ) ) ? ' selected="selected"' : '' ),
                    $term->name,
                    $term->count
                );
            }
            echo '</select>';
        }
    
    }
    add_action( 'restrict_manage_posts', 'filter_cars_by_taxonomies' , 10, 2);

?>

https://generatewp.com/filtering-posts-by-taxonomies-in-the-dashboard/