searchwp-customizations.php

<?php

// Limit SearchWP results to Posts and Pages.
add_filter( 'searchwp\query\mods', function( $mods, $query ) {
  $mod = new \SearchWP\Mod();

  $mod->set_where( [ [
    'column'  => 'source',
    'value'   => [
      \SearchWP\Utils::get_post_type_source_name( 'post' ),
      \SearchWP\Utils::get_post_type_source_name( 'page' )
    ],
    'compare' => 'IN',
  ] ] );
  
  $mods[] = $mod;
  
  return $mods;
}, 10, 2 );