Add fadeAnimation style for DockPanel
MODIFY
WalletWasabi.Fluent/Views/Login/LoginView.axaml
WalletWasabi.Fluent/Views/Login/LoginView.axaml
VerticalAlignment="Center"
LastChildFill="True">
<DockPanel.Styles>
+ <Style Selector="DockPanel.fadeAnimation[IsVisible=true]">
+ <Setter Property="Opacity" Value="1"/>
+ </Style>
+ <Style Selector="DockPanel.fadeAnimation[IsVisible=False]">
+ <Setter Property="Opacity" Value="0"/>
+ </Style>
+ <Style Selector="DockPanel.fadeAnimation">
+ <Setter Property="Transitions">
+ <Transitions>
+ <DoubleTransition Property="Opacity" Duration="0:0:0.2"/>
+ </Transitions>
+ </Setter>
+ </Style>
<Style Selector="StackPanel.fadeAnimation[IsVisible=true]">
<Setter Property="Opacity" Value="1"/>
</Style>

Add fadeAnimation style for DockPanel