How to Use the Search Function in XLSForm

Dear community members,

I am trying to upload an XLS kobo form , where users can select the nationality of individuals and also i am using another .csv file to provide the list of countries for nationalities Select_one.
I am using a specific Humanitarian Kobo server and i am wondering why i have an issue and the list of countries do not appear after deployment of the form.

Thank you so much.

@mhdtunisia, you could do it as outlined in this post discussed previously: