There are two ways to resize both the field label width as well as the field width itself.
Drag and Drop the Width
1. In the form editor, select the field you want to resize.
2. Drag the label corner or the field corner to resize.
Enter the Width Manually
1. Select the field you want to resize.
2. Enter a pixel value for the Label Width and/or Field Width.
Great job! Pretty easy, right?