Look in your designer - if you select your input textfield and then look at your properties tab near the bottom is a property that you can set called: "Autocapitalisation Mode" - you can make your choice there.
Sorry i forgot to write that this is FloatLabeledTextField, but you put me on the right way
B4X:
'Per Nome e Cognome
Dim no As NativeObject = fle_nome_cognome
no.SetField("floatingLabelActiveTextColor", no.ColorToUIColor(Colors.White))
Dim s As AttributedString
s.Initialize("Il tuo Nome e Cognome", Font.DEFAULT_BOLD, Colors.White)
no.RunMethod("setAttributedPlaceholder:", Array(s))
fle_nome_cognome.Autocapitalize = fle_nome_cognome.AUTOCAPITALIZE_ALL