Hey,
Well same for here the SfNavigationDrawer package is missing the ToggleDrawer() method.
public partial class Test : ContentPage
{
ObservableCollection<String> list = new ObservableCollection<string>();
SfNavigationDrawer navigationDrawer = new SfNavigationDrawer();
public Test()
{
InitializeComponent();
list.Add("Home");
list.Add("Profile");
list.Add("Inbox");
list.Add("Outbox");
list.Add("Sent");
list.Add("Draft");
listView.ItemsSource = list;
btn.Clicked += (sender, e) =>
{
navigationDrawer.ToggleDrawer();
};
}