The date format of the DataFormDateEditor is defined per the application Locale and I am afraid we do not provide means to specify it.
So, basically, you can change the application Locale, thus not taking into account the target device Locale.
Setting the application Locale on Android is a little bit tricky, I have tested the following snippet inside OnCreate method of your MainActivity which works:
var locale = new Java.Util.Locale("en", "GB");
Java.Util.Locale.Default = locale;
var context = Application.Context;
context.Resources.Configuration.Locale = locale;
The problem is it uses deprecated API, here are some discussions on StackOverflow on the matter that can help:
Let me know if I can assist with anything else.
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