Style groove change

[Simone1972]

Dear all,
It looks pretty easy to give a "shuffle" effect to a flat 16 beat style (by using the groove/swing function).
Nevertheless I'm not able to perform the opposite operation: how can I convert a shuffle beat into a flat 16bit one?

I don't find any useful information in the various manuals.
I own a PSR-SX900 but I believe the issue is common on all models.

This is the original style I'm trying to tweak:
https://1drv.ms/u/s!AvARkGD2bkFchP0trgZp-R2z7__uYA?e=R66YBY

Regards