Remove Subject Dropdown of Prestashop Contact Form Page

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Contact form is a seemingly simple feature, that most websites mess up. While a broken or poorly designed contact form may not be the end-all problem with a website, there’s no reason that it shouldn’t work correctly. Here are 13 reasons why your web site should have a contact form according to contactus.com :
  1. It’s more convenient for users.
  2. It’s more secure.
  3. It guarantees that you’ll receive the message.
  4. Customers can contact you at all hours.
  5. It helps you get more information.
  6. You can provide better service.
  7. You can customize it to suit your site’s particular needs.
  8. It makes data easier to analyze.
  9. It helps your customer relationship management.
  10. It’s more mobile-friendly.
  11. It can collect donations.
  12. It can be shown to site browsers whenever you want.
  13. It’s a better “call to action.”
Prestashop already provided contact form page. By default it has two subject heading in the contact form that you could choose, customer services and webmasters. But, what if you only need to show one subject heading in the contact form on your prestashop store ?
Here is how to do it :

1. Go to your themes folder, and open open contact.form.tpl on your favorite text editor.
2. Dont forget to backup the file first before you edit it.
3. After backup, find the following codes
<select id="id_contact" class="form-control" name="id_contact">
                        <option value="0">{l s='-- Choose --'}</option>
                        {foreach from=$contacts item=contact}
                            <option value="{$contact.id_contact|intval}" {if isset($smarty.request.id_contact) && $smarty.request.id_contact == $contact.id_contact}selected="selected"{/if}>{$contact.name|escape:'html':'UTF-8'}</option>
                        {/foreach}
                    </select>
4. change it to, for example <input type="hidden" name="id_contact" value="1">
Please notice the value must be a valid contact id