Styling slider as described in figma
ADD
WalletWasabi.Fluent/Styles/Slider.axaml
+<Styles xmlns="https://github.com/avaloniaui"
+ xmlns:sys="using:System"
+ xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+ <Style Selector="Slider /template/ Thumb:pointerover">
+ <Setter Property="BorderThickness" Value="2" />
+ <Setter Property="BorderBrush" Value="{DynamicResource SliderThumbBorderBrushPointerOver}" />
+ </Style>
+</Styles>
\ No newline at end of file

MODIFY
WalletWasabi.Fluent/Styles/Styles.axaml
WalletWasabi.Fluent/Styles/Styles.axaml
<StyleInclude Source="avares://WalletWasabi.Fluent/Styles/DataGrid.axaml" />
<StyleInclude Source="avares://WalletWasabi.Fluent/Styles/RadioButton.axaml" />
<StyleInclude Source="avares://WalletWasabi.Fluent/Styles/SettingsLayout.axaml" />
+ <StyleInclude Source="avares://WalletWasabi.Fluent/Styles/Slider.axaml" />
</Styles>

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseDark.axaml
WalletWasabi.Fluent/Styles/Themes/BaseDark.axaml
<Color x:Key="LineChartAreaGradientEndStopColor">#0078A827</Color>
<Color x:Key="LineChartLineColor">#78A827</Color>
+ <Color x:Key="SliderTrackValueFill">#8093AE</Color>
+ <Color x:Key="SliderTrackValueFillPointerOver">#8093AE</Color>
+ <Color x:Key="SliderTrackValueFillPressed">#8093AE</Color>
+ <Color x:Key="SliderThumbBackground">#8093AE</Color>
+ <Color x:Key="SliderThumbBackgroundPointerOver">#8093AE</Color>
+ <Color x:Key="SliderThumbBackgroundPressed">#8093AE</Color>
+ <Color x:Key="SliderThumbBorderBrushPointerOver">#010D20</Color>
+
<SolidColorBrush x:Key="TextControlBackground">#1A8093AE</SolidColorBrush>
<SolidColorBrush x:Key="TextControlBackgroundFocused">#1A8093AE</SolidColorBrush>
<SolidColorBrush x:Key="TextControlBackgroundPointerOver">#1A8093AE</SolidColorBrush>

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseLight.axaml
WalletWasabi.Fluent/Styles/Themes/BaseLight.axaml
<Color x:Key="LineChartAreaGradientCursorStrokeColor">#F078A827</Color>
<Color x:Key="LineChartLineColor">#78A827</Color>
+ <Color x:Key="SliderTrackValueFill">#0B2545</Color>
+ <Color x:Key="SliderTrackValueFillPointerOver">#0B2545</Color>
+ <Color x:Key="SliderTrackValueFillPressed">#0B2545</Color>
+ <Color x:Key="SliderThumbBackground">#0B2545</Color>
+ <Color x:Key="SliderThumbBackgroundPointerOver">#0B2545</Color>
+ <Color x:Key="SliderThumbBackgroundPressed">#0B2545</Color>
+ <Color x:Key="SliderThumbBorderBrushPointerOver">#8093AE</Color>
+
<Color x:Key="TextControlBackground">#EFEFEF</Color>
<Color x:Key="TextControlBackgroundFocused">#EFEFEF</Color>
<Color x:Key="TextControlBackgroundPointerOver">#EFEFEF</Color>

Styling slider as described in figma