Over-rides the default face size in the font setting.

A simple numeric scalar gives the size in points:

leaf.Size 13.5

This can be used in a style to change size, regardless of the current face, for example:

'small' leaf.DefineStyle 'size' 11.5

... will retain all other settings, but will reduce the size.

Any number is valid here – NewLeaf is not restricted to half-point increments (as many Microsoft tools are).