lookup Listbox type search in Nintex Forms

[Ahmadh34]

Hi all,

I have recently created a form using Nintex forms on a SharePoint document library which has a multi-select lookup field that shows numbers, my issue is that when I type on the field listbox, the search as you type searches only from the beginning of the numbers, for example if I have a number like this "3200021325", I want when I type 1325 to find the number and not having to write it all from the beginning.

This feature is available in the SharePoint OOB edit form but when I switched to Nintex forms I lost it. any ideas?

Thanks.