Whoops; you're right. I hadn't noticed the AM/PM switch. Sorry I wasn't paying attention.
Reflow:
When the Reader opens a file, it shows it at default "S" size; for PDFs, it shows the whole PDF page in the ~3.5x4.5 screen. If the full page is letter sized, the text is very small.
The Reader has two more sizes: M and L. For most files (LRF, RTF, TXT, ePub), it'll increase the font size by a certain percentage for each of those. Many books that I read at S during the day, I put at M for reading in dim light in the evening.
For PDFs, the M & L buttons do something different: they reflow the text, removing the white border around the page, setting the text to left-justify, no indents, with a small space (about half a line) between paragraphs. It may also increase the size a bit, but it's hard to tell exactly how that works, since the first view is "whole page" rather than a particular font size.
For well-made PDFs, this results in reading that's very similar to a website cut into 4.5" long pieces per page. Reading good PDFs on reflow is like reading any other filetype; you get all the content, it's nicely arranged For poorly-made PDFs, it results in full lines, then a line and a half, then a full line, then another line and a half. (I'll see if I can find examples.)
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