For JabRef 5.3--2021-03-11--8bb7668,
in Options -> Preferences, Tab File, there is a section entitled "Export sort order":

Same in Library -> Library properties:

Is your suggestion for improvement related to a problem? Please describe.
Currently, these items do not affect the sort order when exporting entries (like using File -> Export).
They alter the sort order when saving the library.

Describe the solution you'd like
Make clear that these items affect the saving order by changing "Export [...]" into "Save [>...]"