Thank you for answering.
Yes I did the same manipulation before posting.
I misspelled that setting name, I'm on Android since Froyo lol.
Either way I will try to catch a log (is there a logger inside MiXplorer or should I go the old way with another app ?)
Ha! Using that terminology in Android 10 will make you seem like an old timer indeed. Description of MiXplorer's built in logging here: https://xdaforums.com/showpost.php?p=65157367&postcount=7, but for a thing like this a logcat may be in order... or some forehead slap realization about new security settings in Android 10. With that in mind it might not be worth a logcat until there is more user or developer input.