Some MOBI books only display in "Docs" on Kindle Fire. This slide shows you how to display MOBI files as normal books on your Kindle Fire.

1. How to make mobi files display as
books on Kindle Fire
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2. MOBI is a popular ebook format. The Kindle Fire has a good support
of MOBI. But some MOBI ebooks can’t display in “Books” on Kindle
Fire. They are put in “Docs” and mixed with other documents. This
condition make us inconvenient to manage books. So it’s better to
display all MOBI files as books so that you can view all MOBI book in
“Books”. This article will show you how to do this job.

3. 1. Visit calibre-ebook.com to download and install Calibre on your
PC. Open Calibre and click “Add books” button to add your MOBI
files.

4. 2. Click “Convert books” and a window will pop up. First, select output
format as “MOBI” from the dropdown menu. Second, click “MOBI Output”
and delete “[PDOC]” at “Kindle options”. Just keep the Personal Doc Tag
blank.

5. 3. Click “OK” to start conversion. The conversion job will finish in
several minutes. Click “Path : Click to open” to open the directory
where the new MOBI file stored.

6. 4. Use a usb cable to connect your Kindle Fire to PC and transfer
the converted MOBI files to the folder “Books” at the root directory.
Then you can find the MOBI books in “Books” on your Kindle Fire.
Source: http://www.epubor.com/how-to-make-mobi-files-display-as-books-on-kindle-fire.html