size fied

field size of the form is automatically generated and control the size of it, that they are more widh??

If I understood you correctly, you’re trying to change the size of generated fields inside a Form.

My understanding of this issue is that you need to provide the form with a custom field factory, where you can change the default generated fields. Read the chapter from the Book of Vaadin that discusses form field generation:
5.17 Form
and the section “Generating Proper Fields with a FormFieldFactory”.

It is right to do the following to change the size of the fields?

Field campoNombre=this.myForm.getField(“nombre”);
this.myForm.addField(“nombre”, campoNombre);

doing this changes my size, I do not want to create a new field, it is right to do this?? a??