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I understand that you wish to adjust a textbox on your form.
However, can you please specify with us what sort of adjustment you want to make to your textbox on your form?
There are quite a few ways to do this so I will give you a couple hints below:
(A) Just create a form then while editing it in the formbuilder add a textbox and with it selected you will see tools at the very top toolbar to make all sorts of adjustments such as width.
(B) You can make field adjustments to reposition it wherever you want your textbox field.