How to edit the contact form?

Hey,
Thanks for the answere.
Maby i should explain the problem a bit more:

So first i remove the phone-number from the contact-form.html.twig by commenting out the block:
 

{#       
 {% block cms_form_contact_input_phome %}
            {% sw_include '@Storefront/storefront/element/cms-element-form/form-components/cms-element-form-input.html.twig'
                with {
                fieldName: 'phone',
                required: true,
                additionalClass: 'col-md-6',
                label: 'account.personalPhoneLabel',
                placeholder: 'account.personalPhonePlaceholder'
            }
            %}
        {% endblock %} 
#}

After that i clear the cache. So my frontend take over the change (the phone number field is no longer visible).

After that i change the email-templete in the settings. I remove the phone-number part.
So now i want to use my contact-formular on the frontend. I fill in all the visible fields (the phone number is not visible) and click submit.
I get an errror message: “This value should not be empty”.

If i add the phone-number back to the form and fill out the field everthing works fine.

I guess there is a validation-script or something. This script wants an input for the phone-number but there is no phone-number so the script returns an error message.

What is the usal way to deal with that problem?

We need to remove the phone-number cause of data protection.

Thanks for your help!