Tweaking to make it look better
MODIFY
WalletWasabi.Fluent/Styles/CuedScrollViewer.axaml
WalletWasabi.Fluent/Styles/CuedScrollViewer.axaml
<ControlTemplate>
<Grid ColumnDefinitions="*,Auto" RowDefinitions="*,Auto">
+ <Grid.Resources>
+ <StreamGeometry x:Key="UpArrow">M 0 4 L 8 4 L 4 0 Z</StreamGeometry>
+ <StreamGeometry x:Key="DownArrow">M 0 0 L 4 4 L 8 0 Z</StreamGeometry>
+ </Grid.Resources>
+
<ScrollContentPresenter Name="PART_ContentPresenter"
Grid.Row="0"
Grid.Column="0"
Visibility="{TemplateBinding HorizontalScrollBarVisibility}"
Grid.Row="1"
Focusable="False" />
+
<ScrollBar Name="PART_VerticalScrollBar"
MaxWidth="10"
MinWidth="2"
Visibility="{TemplateBinding VerticalScrollBarVisibility}"
Grid.Column="1"
Focusable="False" />
+
<Panel x:Name="PART_ScrollBarsSeparator" Grid.Row="1" Grid.Column="1"
Background="{DynamicResource ScrollViewerScrollBarsSeparatorBackground}" />
</MultiBinding>
</RepeatButton.IsVisible>
<Viewbox Classes="ScrollViewerCuePath">
- <Path Data="M 0 4 L 8 4 L 4 0 Z" Classes="ScrollViewerCuePath" />
+ <Path Data="{StaticResource UpArrow}" Classes="ScrollViewerCuePath" />
</Viewbox>
</RepeatButton>
</RepeatButton.IsVisible>
<Viewbox Classes="ScrollViewerCuePath" Stretch="Fill">
- <Path Data="M 0 0 L 4 4 L 8 0 Z" Classes="ScrollViewerCuePath" />
+ <Path Data="{StaticResource DownArrow}" Classes="ScrollViewerCuePath" />
</Viewbox>
</RepeatButton>
</Grid>
<Style Selector="Path.ScrollViewerCuePath">
<Setter Property="Fill" Value="{StaticResource AcrylicTrimForeground}" />
+ <Setter Property="Opacity" Value="0.9" />
</Style>
<Style Selector="Viewbox.ScrollViewerCuePath">
- <Setter Property="Width" Value="25" />
- <Setter Property="Height" Value="10" />
+ <Setter Property="Width" Value="20" />
+ <Setter Property="Height" Value="8" />
<Setter Property="IsHitTestVisible" Value="False" />
- <Setter Property="(Grid.ColumnSpan)" Value="2" />
+ <Setter Property="Grid.ColumnSpan" Value="2" />
</Style>
<Style Selector="RepeatButton">

Tweaking to make it look better