Apple Newton Press (Macintosh) - Manual (Page 45)

Creating borders
When formatting text, you can place borders around selected paragraphs or
graphics to make them stand out or increase legibility. A single-line border
appears around the paragraphs to which you apply a border.
To apply a border:
1 Select the text you want to place a border around.
2 Choose Border from the Format menu.
To remove a border, select the text or graphic that has the border and choose
Border again from the Format menu.
45 Formatting Your Newton Book
You can add borders around
individual paragraphs or
groups of paragraphs.