Idk why PreviewItem's opacity is 0.6 but it doesnt make sense and gives the illusion that the icon is of different color as the main accent one. There's probably alot more of this same stuff around.
MODIFY
WalletWasabi.Fluent/Controls/PreviewItem.axaml
WalletWasabi.Fluent/Controls/PreviewItem.axaml
<ControlTemplate>
<DockPanel Background="Transparent">
<PathIcon Width="{TemplateBinding IconSize}" Height="{TemplateBinding IconSize}"
- Data="{TemplateBinding Icon}" Opacity="0.6" Foreground="{DynamicResource SystemAccentColor}"
+ Data="{TemplateBinding Icon}" Foreground="{DynamicResource SystemAccentColor}"
IsVisible="{TemplateBinding IsIconVisible}" DockPanel.Dock="Left" />
<DockPanel DockPanel.Dock="Right" Margin="30 0 0 0">
<TextBlock Name="PART_Text" Text="{TemplateBinding Text}" DockPanel.Dock="Top" Margin="0 0 0 5" Opacity="0.6" />

Idk why PreviewItem's opacity is 0.6 but it doesnt make sense and gives the illusion that the icon is of different color as the main accent one. There's probably alot more of this same stuff around.