change previewitem style back to green and half transparent
MODIFY
WalletWasabi.Fluent/Controls/PreviewItem.axaml
WalletWasabi.Fluent/Controls/PreviewItem.axaml
<DockPanel Background="Transparent">
<PathIcon Width="{TemplateBinding IconSize}" Height="{TemplateBinding IconSize}"
Data="{TemplateBinding Icon}"
+ Opacity="0.5"
+ Foreground="{StaticResource SystemAccentNeutralColor}"
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" />

change previewitem style back to green and half transparent