The first method is to enlarge the size of the field so the font will fit into it when converted to a PDF for emailing.
You can enlarge this selected area in two ways:
Click and hold the left mouse button while positioned over one of the small black squares around the selected field until the cursor changes to a cross. You can then drag the size of the field out to the desired position.
The other method is to double-click the selected area to allow the field size to be changed.