MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="SfTabviewSample.MainPage"
             xmlns:core="clr-namespace:Syncfusion.Maui.Core;assembly=Syncfusion.Maui.Core"    
             xmlns:local="clr-namespace:SfTabviewSample"
             xmlns:tabView="clr-namespace:Syncfusion.Maui.TabView;assembly=Syncfusion.Maui.TabView">


    <ContentPage.BindingContext>
        <local:ViewModel />
</ContentPage.BindingContext>

    <ContentPage.Content>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="0.1*"/>
                <RowDefinition Height="0.9*"/>
            </Grid.RowDefinitions>
            <Grid Grid.Row="0">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Button Text="Add TabItem" Grid.Column="0" x:Name="Additem" Clicked="Additem_Clicked"/>
                <Button Text="Remove TabItem" Grid.Column="1" x:Name="Removeitem" Clicked="Removeitem_Clicked"/>
                <Button Text="Insert TabItem" Grid.Column="2" x:Name="Insertitem" Clicked="Insertitem_Clicked"/>
            </Grid>
            <StackLayout Grid.Row="1">
                <tabView:SfTabView x:Name="tabView" VerticalOptions="FillAndExpand">
                    <tabView:SfTabItem Header="Contacts">
                        <tabView:SfTabItem.Content>
                            <ListView Margin="0,20,0,0" RowHeight="70" x:Name="listView" ItemsSource="{Binding ContactList}">
                                <ListView.ItemTemplate>
                                    <DataTemplate>
                                        <ViewCell>
                                            <StackLayout Orientation="Vertical" Margin="30,0,0,0">
                                                <Label Text="{Binding Name}" FontSize="24" />
                                                <Label Text="{Binding Number}" FontSize="20" TextColor="LightSlateGray" />
                                            </StackLayout>
                                        </ViewCell>
                                    </DataTemplate>
                                </ListView.ItemTemplate>
                            </ListView>
                        </tabView:SfTabItem.Content>
                    </tabView:SfTabItem>
                    <tabView:SfTabItem Header="Calls">
                        <tabView:SfTabItem.Content>
                            <StackLayout BackgroundColor="LightGray"  x:Name="AllCallsGrid">
                            </StackLayout>
                        </tabView:SfTabItem.Content>
                    </tabView:SfTabItem>
                    <tabView:SfTabItem Header="Favorites">
                        <tabView:SfTabItem.Content>
                            <Grid BackgroundColor="LightGreen"  x:Name="FavoritesGrid" />
                        </tabView:SfTabItem.Content>
                    </tabView:SfTabItem>
                </tabView:SfTabView>
            </StackLayout>
        </Grid>
    </ContentPage.Content>   
</ContentPage>