When opening an Editor element, the NavBar disappears, how can I fix this?

Question

Android

I have an application similar to messengers, the problem is that when I go to the dialog page with the NavBar user (I will attach pictures to the question), so the NavBar is visible, but when I click on the Editor element, the keyboard opens and the NavBar is hidden, and after the message is sent, the Editor loses focus and hides. How can I make it stay in place.

Here is the code, how I got to this page:

// Нажатие по ячейке чата
    async void Handle_ItemTapped(object sender, ItemTappedEventArgs e)
    {
        var v = (ChatListModel)e.Item;
        await Navigation.PushAsync(new ChatPage(v.Id, v.Title));

    }

Page code in comments