Admin List Dynamic Heading

When you take a look at wp-admin/edit.php, you’ll see that this string is printed with this line:

echo esc_html( $post_type_object->labels->name );

So there is no filter to modify it in edit.php.

There are no filters in get_post_type_object also, so we can’t change it in there too, but…

The object for given post type is stored in global variable called $wp_post_types, so you can modify it:

function change_page_post_type_object() {
    global $wp_post_types;

    $wp_post_types['page']->labels->name="Not-Pages ;)";
}
add_action( 'init', 'change_page_post_type_object' );

And that’s the result: