this work for me.
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="using:EasyCom"
x:Class="EasyCom.MasterPage"
Padding="20,100,30,120"
IconImageSource="hamburger.png"
xmlns:syncfusion="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms"
xmlns:dataSource="clr-namespace:Syncfusion.DataSource;assembly=Syncfusion.DataSource.Portable"
BackgroundImage="menu_e_cardapio.jpg"
Title="Personal Organiser">
<ContentPage.Resources>
<ResourceDictionary>
<local:GroupHeaderConverter x:Key="TemplateConverter"/>
<OnPlatform x:TypeArguments="x:String" x:Key="FFF_Tusj">
<On Platform="Android" Value="FFF_Tusj.ttf#FFF_Tusj" />
<On Platform="UWP" Value="/Assets/FFF_Tusj.ttf#FFF_Tusj" />
<On Platform="iOS" Value="FFF_Tusj" />
</OnPlatform>
</ResourceDictionary>
</ContentPage.Resources>
<ContentPage.BindingContext>
<local:ViewModel />
</ContentPage.BindingContext>
<ContentPage.Content>
<Grid CascadeInputTransparent="True" >
<syncfusion:SfListView x:Name="listView"
Grid.Row="0"
ItemSize="50"
AllowGroupExpandCollapse="True"
RowSpacing="0"
SelectionMode="Single"
DragStartMode="OnHold"
ItemSpacing="1"
AutoFitMode="Height"
GroupHeaderSize="15"
ItemsSource="{Binding BookInfo}"
>
<syncfusion:SfListView.DataSource>
<dataSource:DataSource>
<dataSource:DataSource.GroupDescriptors>
<dataSource:GroupDescriptor PropertyName="menuOptionlevel" />
</dataSource:DataSource.GroupDescriptors>
</dataSource:DataSource>
</syncfusion:SfListView.DataSource>
<syncfusion:SfListView.Behaviors>
<local:Behavior/>
</syncfusion:SfListView.Behaviors>
<!-- Menu Pai -->
<syncfusion:SfListView.GroupHeaderTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout Spacing="0"
BackgroundColor="Transparent"
Padding="0,0,0,0">
<Label Text="{Binding Key}"
FontSize="15"
FontAttributes="Bold"
TextColor="Red"
FontFamily="{StaticResource FFF_Tusj}"
VerticalOptions="Center"
HorizontalOptions="Start"/>
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>
<!-- Menu Filho -->
<syncfusion:SfListView.ItemTemplate >
<DataTemplate>
<ViewCell>
<ViewCell.View>
<StackLayout Spacing="0"
BackgroundColor="Transparent"
Padding="15,0,0,0">
<Image Source= "ic_1.png"
VerticalOptions="Center"
HorizontalOptions="StartAndExpand"
HeightRequest="10"/>
<Label LineBreakMode="NoWrap"
TextColor="White"
HorizontalOptions="StartAndExpand"
VerticalOptions="Start"
Text="{Binding menuOptionName}"
FontAttributes="Bold"
FontFamily="{StaticResource FFF_Tusj}" />
</StackLayout>
</ViewCell.View>
</ViewCell>
</DataTemplate>
</syncfusion:SfListView.ItemTemplate>
</syncfusion:SfListView>
</Grid>
</ContentPage.Content>
</ContentPage>