Hi,
In LC Designer ES2 the easiest way is to set up objects as you want them to appear, eg font, paragraph, borders, etc and then drag these to the Custom Object library. In new forms you can then drag these back out into the form as normal.
In ADEP Designer 10, you can define the fonts for both captions and values, under Options:
Note: the above screenshot is from ADEP Designer 10.
Niall