Unfortunatly my posting got lost. So, again, in the 1.4.0 reference manual at page 86 you can read that it will record 16 tracks and also the restrictions for playback ( same length an 16 files).
That should be enough information to know that in multitrack mode always 16 tracks will be recorded.
On the other side, SQ-Drive Recording never was an option for me because all my tests told me that it is not reliable enough. I went always the DAW route either with USB B or Dante (or both). Never had an issue since Firmware 1.1.