To resize the form, move the mouse to the lower right hand
corner of the form. The mouse pointer changes into the resize
pointer, as shown in the picture below.

Then, drag the lower right hand corner to the correct size. To drag
the corner, click and hold the left mouse button and move the mouse
before you release the button.
If you reduce the size of a form so that not all fields are visible, a vertical scroll bar appears on the right edge of the form.