add margin for nav item selected indicator.
MODIFY
WalletWasabi.Fluent/Controls/NavBarItem.xaml
WalletWasabi.Fluent/Controls/NavBarItem.xaml
<Setter Property="Template">
<ControlTemplate>
<Panel>
- <Border x:Name="Indicator" BorderThickness="2 0 0 0" />
+ <Border x:Name="Indicator" Margin="4 0 0 0" BorderThickness="2 0 0 0" />
<ContentPresenter Name="PART_ContentPresenter"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"

MODIFY
WalletWasabi.Fluent/Controls/NavBarTreeItem.xaml
WalletWasabi.Fluent/Controls/NavBarTreeItem.xaml
TemplatedControl.IsTemplateFocusTarget="True">
<Grid Name="PART_Header"
Margin="{TemplateBinding Level, Mode=OneWay, Converter={StaticResource TreeViewItemLeftMarginConverter}}">
- <Border x:Name="Indicator" BorderThickness="2 0 0 0" />
+ <Border x:Name="Indicator" Margin="4 0 0 0" BorderThickness="2 0 0 0" />
<ContentPresenter Name="PART_HeaderPresenter"
Focusable="False"
Content="{TemplateBinding Header}"

add margin for nav item selected indicator.