How can I change the width of data field in this form without change the others width fields?

I also need to know how can I block a telephone field only for numbers?

Hi,

To change the width of a specific field, open your form in the form designer:

Then click on the "CSS" tab in the designer.  After that, double click in the field you wish to change, then click on "Width" in the CSS tab.  Change it to whatever you like and it will only change the specific field:

As for the phone field, in the settings for the field there is an option for "Input Mask":

Set that to enabled and it will only accept numbers.

Let us know if you have any further questions and we will be happy to help.