The border is an attribute that may change its style in the web form. You can change the form’s border, a label border, an input element’s border or a container border.
All this can be done really easily using the border style options in the upper toolbar – ‘element style’ section in the form builder.
Steps to change the border style:
1- select the element you want to affect its border.
if you wish to change the form’s border simply do not select any element, or even click outside of the white design area.
5- Save the form.
Read about how to use the ‘auto position‘ feature.