Dynamically change posts_per_page for Pager facet after the first page

<?php

add_filter( 'facetwp_query_args', function( $query_args, $class ) {

  if ( $class->ajax_params['paged'] !== 1  ) {
      $query_args['posts_per_page'] = 2;
  }
    
  return $query_args;

}, 10, 2);