Currently not all platforms have the same Calendar views. You could check at the following link which views exactly are supported in iOS and Android:
We have an internal feature request about supporting MonthNames view across all platforms, I've exposed it as a public feedback item in our Feedback Portal, so you can subscribe to it and cast your vote here: https://feedback.telerik.com/Project/168/Feedback/Details/239409-calendar-monthnames-view-to-be-supported-in-all-platforms
In the meantime, you could skip the MonthNames view in iOS inside ViewChanged event handler using the TryNavigateToUpperView method of the Calendar, here is a sample snippet:
sender, Telerik.XamarinForms.Common.ValueChangedEventArgs<Telerik.XamarinForms.Input.CalendarViewMode> e)
var cal = sender
(cal.ViewMode == CalendarViewMode.MonthNames)
Please try it and let me know whether such an approach would be suitable for you.
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