Add opacity transition
MODIFY
WalletWasabi.Fluent/Views/Wallets/Send/PrivacyControlView.axaml
WalletWasabi.Fluent/Views/Wallets/Send/PrivacyControlView.axaml
<ItemsControl.ItemTemplate>
<DataTemplate x:DataType="vm:LabelViewModel">
<Button Classes="plain" Margin="5" Command="{Binding ClickedCommand}" Classes.faded="{Binding IsFaded}">
+ <Button.Transitions>
+ <Transitions>
+ <DoubleTransition Property="Opacity"
+ Easing="{StaticResource FluentEasing}"
+ Duration="0:0:0.25"/>
+ </Transitions>
+ </Button.Transitions>
<i:Interaction.Behaviors>
<behaviors:BindPointerOverBehavior IsPointerOver="{Binding IsPointerOver}" />
</i:Interaction.Behaviors>

Add opacity transition