Originally Posted by Booxtor
Unfortunatell it is impossible and there is no chance to change it
PDF Reader is not really a PDF editing tool.
The file format PDF, or Portable Document Format, is often used to maintain the integrity of a document. That means regardless of the application software you are using, the document will appear the same. So in order to change the document, you will need either convert the file, or use a specific PDF editing program to change the document.
What about "Text Reflow" mode? It would be nice if we can change font in this mode...