search bar in Navbar

On Andriod

I have this

So I was wondering if there is a way to put the search bar on top, so it would look like this.

This is the page that has the search

    <Grid
        ColumnDefinitions="*,*,*"
        RowDefinitions="Auto,*">

        <Grid
            Grid.ColumnSpan="3"
            BackgroundColor="{OnIdiom Desktop=#e8e8e8,
                                      Phone=#502bd4}">

            <Grid
                Grid.Column="1"
                HorizontalOptions="Center">
                <Border
                    Margin="10"
                    StrokeThickness="{OnIdiom Desktop=1,
                                              Phone=0}">
                    <Border.StrokeShape>
                        <RoundRectangle CornerRadius="8" />
                    </Border.StrokeShape>
                    <local:BorderlessSearchBar
                        x:Name="SearchStudentBar"
                        Placeholder="Search for student"
                        WidthRequest="400">
                        <local:BorderlessSearchBar.Behaviors>
                            <mct:EventToCommandBehavior
                                Command="{Binding SearchCommand}"
                                CommandParameter="{Binding Source={x:Reference SearchStudentBar}}"
                                EventName="TextChanged" />
                        </local:BorderlessSearchBar.Behaviors>
                    </local:BorderlessSearchBar>
                </Border>
            </Grid>
        </Grid>

        <CollectionView
            Grid.Row="1"
            Grid.ColumnSpan="3"
            Margin="20"
            HorizontalOptions="Center"
            ItemsSource="{Binding Students}">

            <CollectionView.ItemTemplate>

                <DataTemplate x:DataType="model:DemyUser">

                    <Border
                        StrokeShape="RoundRectangle 8"
                        StrokeThickness="2">

                        <Grid
                            Margin="10"
                            ColumnDefinitions="*,*"
                            RowDefinitions="20,20">

                            <Label
                                FontAttributes="Bold"
                                Text="{Binding DemyId, StringFormat='Id: {0}'}" />

                            <Label
                                Grid.Row="1"
                                FontAttributes="Bold"
                                Text="{Binding FullName, StringFormat='Name: {0}'}" />

                            <Label
                                x:Name="ContactLbl"
                                Grid.RowSpan="2"
                                Grid.Column="1"
                                FontFamily="Mat"
                                FontSize="40"
                                HorizontalOptions="EndAndExpand"
                                Text="{x:Static helpers:IconFont.Email}"
                                VerticalTextAlignment="Center">
                                <Label.GestureRecognizers>
                                    <PointerGestureRecognizer
                                        PointerEnteredCommand="{Binding Path=ContactPointerEnteredCommand, Source={x:RelativeSource AncestorType={x:Type vm:MyCoursesDetailPageViewModel}}}"
                                        PointerEnteredCommandParameter="{Binding Source={x:Reference ContactLbl}}"
                                        PointerExitedCommand="{Binding Path=ContactPointerExitedCommand, Source={x:RelativeSource AncestorType={x:Type vm:MyCoursesDetailPageViewModel}}}"
                                        PointerExitedCommandParameter="{Binding Source={x:Reference ContactLbl}}" />
                                </Label.GestureRecognizers>
                            </Label>
                        </Grid>
                    </Border>
                </DataTemplate>
            </CollectionView.ItemTemplate>
        </CollectionView>
    </Grid>

</ContentPage>

I could also set the navigation bar to false or this page only, but if I do this, I get rid of the back button.