First:You need to install the KFX OUTPUT plugin, then restart Calibre
Now
Preferences Behavior: Will have KFX on the list for Preferred Output format.
Also, Attach your device:right-click the device icon: configure:
Move (and tick) KFX to the top (before other ticked formats)
The way Calibre uses that list is If there IS a ticked format in the Library, that is sent.
If there IS NOT, then Calibre converts to one (that is ticked) closest to the top
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