GARAŽA forum

Reducing or increasing font size across whole document

There are built-in commands for this. The Grow Font and Shrink Font commands
are assigned the default shortcuts Ctrl+ and Ctrl+ and these will increase
or decrease the size of each character to the next/previous size on the font
size dropdown. The Grow Font One Point and Shrink Font One Point commands
are assigned the default shortcuts Ctrl+] and Ctrl+[ and these will increase
or decrease the size by one point at a time.

If different parts of the selected text have different sizes, they'll be
affected separately. For example, if you have selected some text in 8 pt and
some in 14 pt, and you apply Grow Font to the whole selection, the pieces
become 9 pt and 16 pt respectively.

For your request, just select the whole document (Ctrl+A) and then press the
appropriate shortcut.