Hi JohanAu,
Thanks for your help doing some test.
Zorro support just told me there is a new beta version where you can set the mumber of decimals.

"we have today uploaded a new beta version 1.17.9 where you can set up the account decimals in the Currency column of the account list, f.i. "BTC.8" for 8 decimals."

Thanks for your input. Will do some more testing with this version as soos as I have some time.
Vincenzo