This filter option toggles how the layout detection of i-net PDFC will react to PDF files. By default, i-net PDFC will try to detect the layout of the document pages to some extent. But with this option activated, the original print order of the file will be used. It's recommended to only use this option if the document is a PDF that was generated by a text processor.
For further details can be found on the page of this parser extension.
With this option, the PDF parser will drop the mapping from character numbers to readable text. This often solves issues with intentionally obfuscated PDF files, which don't have this mapping in the first place. On the downside, it may void the readability of the differences messages and won't work if the CMAP of both documents is different. So it's not a general solution, but often works for PDFs generated by the same application.