Originally Posted by greenapple
Just use the default settings when you use Calibre for formatting. You could upscale the font size with Calibre to 14pt or even 16pt.
In any case, you don't really need Calibre if you're only bothered by the font size. You could always change the size on Story itself. Press the key with a magnifying glass (it's on the top row on the keyboard) to make adjustments.
Does this increase the size of font even for pdf files?