How to visible scroll bar in listview UWP

I added ScrollViewer.VerticalScrollBarVisibility="Visible" into ListView tab, but scrollbars like on the right of the picture is not displayed. It only shows up when I move the mouse near the scrollbar.
★How to display it all time? and may I custom this scrollbar? (Expectation is the picture on the left)
Solution
It is a bit troublesome to modify from the code. You can set it directly in the Settings.
Settings> Accessibility> Visual Effects> Always show scrollBars.
The following content is about how to modify ScrollViewer and ListView style from the code side.
The default styles of all the controls of UWP are stored in the Generic.xaml file. The file location is as follows
C:\Program Files (x86)\Windows Kits\10\DesignTime\CommonConfiguration\Neutral\UAP\10.0.22621.0\Generic\generic.xaml
Open the Generic.xaml search for Windows.UI.Xaml.Controls.ListView,Windows.UI.Xaml.Controls.Primitives.ScrollBar and Windows.UI.Xaml.Controls.ScrollViewer, copy the style we need to Page.Resource.
Modify the content of Collapsed in VisualStateGroup x:Name="ConsciousStates" to keep the scrollbar expanded and not collapsed. The full code is here.
<!-- Default style for Windows.UI.Xaml.Controls.Primitives.ScrollBar -->
    <Style x:Key="ScrollBarStyle1" TargetType="ScrollBar">
        <Setter Property="MinWidth" Value="{ThemeResource ScrollBarSize}" />
        <Setter Property="MinHeight" Value="{ThemeResource ScrollBarSize}" />
        <Setter Property="Background" Value="{ThemeResource ScrollBarBackground}" />
        <Setter Property="Foreground" Value="{ThemeResource ScrollBarForeground}" />
        <Setter Property="BorderBrush" Value="{ThemeResource ScrollBarBorderBrush}" />
        <Setter Property="IsTabStop" Value="False" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ScrollBar">
                ...
                ...
    <VisualStateGroup x:Name="ConsciousStates">

        <VisualStateGroup.Transitions>
            <VisualTransition From="Expanded" To="Collapsed">

                <Storyboard>
                    <ColorAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                    <ColorAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="ScaleX" To="1.0" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="TranslateX" To="0" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="ScaleY" To="1.0" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="TranslateY" To="0" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                    <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
                </Storyboard>
            </VisualTransition>
        </VisualStateGroup.Transitions>
        <VisualState x:Name="Collapsed" />

        <VisualState x:Name="Expanded">
            <VisualState.Setters>
                <Setter Target="Root.Background" Value="{ThemeResource ScrollBarBackgroundPointerOver}" />
                <Setter Target="Root.BorderBrush" Value="{ThemeResource ScrollBarBorderBrushPointerOver}" />
                <Setter Target="HorizontalTrackRect.Stroke" Value="{ThemeResource ScrollBarTrackStrokePointerOver}" />
                <Setter Target="VerticalTrackRect.Stroke" Value="{ThemeResource ScrollBarTrackStrokePointerOver}" />
                <Setter Target="HorizontalTrackRect.Fill" Value="{ThemeResource ScrollBarTrackFillPointerOver}" />
                <Setter Target="VerticalTrackRect.Fill" Value="{ThemeResource ScrollBarTrackFillPointerOver}" />
            </VisualState.Setters>

            <Storyboard>
                <ColorAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <ColorAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="ScaleX" To="1.0" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="TranslateX" To="0" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="ScaleY" To="1.0" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="TranslateY" To="0" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="{ThemeResource ScrollBarExpandDuration}" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
            </Storyboard>
        </VisualState>
        <VisualState x:Name="ExpandedWithoutAnimation">
            <VisualState.Setters>
                <Setter Target="Root.Background" Value="{ThemeResource ScrollBarBackgroundPointerOver}" />
                <Setter Target="Root.BorderBrush" Value="{ThemeResource ScrollBarBorderBrushPointerOver}" />
                <Setter Target="HorizontalTrackRect.Stroke" Value="{ThemeResource ScrollBarTrackStrokePointerOver}" />
                <Setter Target="VerticalTrackRect.Stroke" Value="{ThemeResource ScrollBarTrackStrokePointerOver}" />
                <Setter Target="HorizontalTrackRect.Fill" Value="{ThemeResource ScrollBarTrackFillPointerOver}" />
                <Setter Target="VerticalTrackRect.Fill" Value="{ThemeResource ScrollBarTrackFillPointerOver}" />
            </VisualState.Setters>
            <!-- The storyboard below cannot be moved to a transition since transitions
                will not be run by the framework when animations are disabled in the system -->

            <Storyboard>
                <ColorAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <ColorAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="ScaleX" To="1.0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="TranslateX" To="0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="ScaleY" To="1.0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="TranslateY" To="0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
            </Storyboard>
        </VisualState>
        <VisualState x:Name="CollapsedWithoutAnimation">
            <!-- The storyboard below cannot be moved to a transition since transitions
                will not be run by the framework when animations are disabled in the system -->

            <Storyboard>
                <ColorAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <ColorAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumb" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" To="{ThemeResource ScrollBarThumbBackgroundColor}" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="ScaleX" To="1.0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalThumbTransform" Storyboard.TargetProperty="TranslateX" To="0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="ScaleY" To="1.0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalThumbTransform" Storyboard.TargetProperty="TranslateY" To="0" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="VerticalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeIncrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalLargeDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalSmallDecrease" Storyboard.TargetProperty="Opacity" To="1" />
                <DoubleAnimation Duration="0" BeginTime="{ThemeResource ScrollBarExpandBeginTime}" Storyboard.TargetName="HorizontalTrackRect" Storyboard.TargetProperty="Opacity" To="1" />
            </Storyboard>
        </VisualState>

    </VisualStateGroup>