Blank space after listview before next element in stacklayout

There is a stack layout on my XAML page within the scroll view. In the stack layout, I have one listview and some other stack layouts. I'm getting extra space between listview and Stack layouts.

XAML Page:

  <ScrollView>
   
    <StackLayout Spacing="-6">
        <ListView Margin="0" 
            ItemsSource="{Binding List}"
            HasUnevenRows="true">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <cells:SummaryCell />
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
        <StackLayout>
            <StackLayout  Spacing="20"  Padding="{DynamicResource ItemsLeftRightPadding}">

                <Label
                    FontAttributes="Bold"
                    Text="{resources:TranslateExtension Text =  closure}"/>

                <StackLayout
                    Spacing="3">
                    <controls:LabelControl
                        BaseText="{resources:TranslateExtension Text =  PONumber}" />
                    <controls:EntryControl  EntryText="{Binding Number}"/>
                </StackLayout>

                <StackLayout Spacing="3">
                    <Label Text="{resources:TranslateExtension Text =  FirstName}"/>
                    <controls:GrayBorderedEntryControl EntryText="{Binding FirstName}" I/>
                </StackLayout>

                <StackLayout  Spacing="3">
                    <Label Text="{resources:TranslateExtension Text =  LastName}"/>
                    <controls:GrayBorderedEntryControl EntryText="{Binding LastName}" IsVisible="True"/>
                </StackLayout>
            </StackLayout>                       

            <StackLayout
                Padding="{DynamicResource SummaryItemsLeftRightPadding}"
                HorizontalOptions="FillAndExpand"
                VerticalOptions="FillAndExpand">
                <controls:AddSignatureControl
                    HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand"
                    Path="{Binding Signature}" />
            </StackLayout>
            </StackLayout> 
        </StackLayout>
    </StackLayout>
 </ScrollView>

We don't recommend using Listview inside scrollview, as this will lead to problems such as those you encounter.

You can try to use Bindable Layouts in Xamarin.Forms to achieve this. This way there will be no such problem.

Please refer to the following code:

<ScrollView  > 
    <StackLayout Spacing="-6">
        <StackLayout BindableLayout.ItemsSource="{Binding Items}"
         Orientation="Vertical" >
            <BindableLayout.ItemTemplate>
                <DataTemplate>
                    <Label Text="{Binding .}" FontSize="30"   />
                </DataTemplate>
            </BindableLayout.ItemTemplate>
        </StackLayout>

        <StackLayout >

           <!--  other code  -->

        </StackLayout>
    </StackLayout>
</ScrollView>