First of all thank you for your answer!

In the meantime, I did some tests.
Now after the various settings and adjustments:
1 - I turn on the Q10 Pro and I don't touch anything anymore.
2 - If as a first film I launch an MKV or an ISO with the MENU 'LITE the TV switch correctly from 60Hz to 24Hz and returns to 60Hz when stopped.
2 - If instead I launch the FULL BLURAY MENU as the first film, the TV remains at 60Hz forever, even if I change the film or do anything else.
Obviously using the WRAPPER this happens both with its MEDIA CENTER and with KODI.
In practice I just have to watch any movie first ( only 1 o 2 seconds ) but without immediately launching the FULL MENU 'BLURAY after which everything I see next will work perfectly at 24Hz, also starting from the FULL BLURAY MENU' !!!!!

Is there any way to make the TV go immediately to 24Hz if I start immediately with the FULL MENU 'BLURAY or nothing can be done?
I will try in the next days KODI 18.5 .....
Thanks again!