How to increase the autocomplete search results in webform
It looks like line 669 here:
https://git.drupalcode.org/project/webform_civicrm/blob/7.x-4.x/includes/contact_component.inc#L669

You can try changing the 12 to something else. It might work to replace it with Civi::settings()-&gt;get('search_autocomplete_count') and then it should use the value under Administer -> Customize Data and Screens -> Search Preferences -> Autocomplete Results. I haven't tested that.