How to disable the vertical scroll of collectionview even if the orientation is horizontal ?

I don't know the main purpose of this but even if the collectionview's orientation was set as horizontal you can also scroll it vertically but in a minimum gap between the item up or down. I just want to disable it, but I can't find a solution in the documentation of Xamarin. By the way, my platform using is UWP.

Here's my code in Collection View part which wrapped by Grid control:

<Grid Grid.Row="1"
              Grid.Column="0"
              Grid.ColumnSpan="2"
              BackgroundColor="White">
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <CollectionView x:Name="CategoryCollectionView"
                            ItemsSource="{Binding Subcategories}"
                            SelectionMode="Single"
                            ItemSizingStrategy="MeasureAllItems"
                            ItemsLayout="HorizontalList"
                            HorizontalScrollBarVisibility="Never"
                            VerticalScrollBarVisibility="Never"
                            SelectionChanged="CategoryCollectionView_SelectionChanged"
                            Grid.Row="0">
                <CollectionView.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="3*"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>

                            <Image Source="{Binding Image}"                                    
                                   Grid.Row="0"/>

                            <StackLayout Grid.Row="1"
                                         VerticalOptions="Start"
                                         HorizontalOptions="Center">
                                <Label Text="{Binding Name}"/>
                            </StackLayout>
                        </Grid>
                    </DataTemplate>
                </CollectionView.ItemTemplate>
            </CollectionView>
        </Grid>