BoxShadow to BoxShadows
MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseDark.xaml
WalletWasabi.Fluent/Styles/Themes/BaseDark.xaml
<SolidColorBrush x:Key="TextForeground">#FFFFFF</SolidColorBrush>
<SolidColorBrush x:Key="AcrylicFallbackColor">#1F1F1F</SolidColorBrush>
<Color x:Key="RegionColor">#FF212121</Color>
- <BoxShadow x:Key="BoxShadow">0 1 4 #121212</BoxShadow>
+ <BoxShadows x:Key="BoxShadow">0 1 4 #121212</BoxShadows>
</Styles.Resources>
<StyleInclude Source="avares://Avalonia.Themes.Fluent/Accents/FluentDark.xaml"/>
</Styles>

MODIFY
WalletWasabi.Fluent/Styles/Themes/BaseLight.xaml
WalletWasabi.Fluent/Styles/Themes/BaseLight.xaml
<SolidColorBrush x:Key="TextForeground">#212121</SolidColorBrush>
<SolidColorBrush x:Key="AcrylicFallbackColor">#E2E2E2</SolidColorBrush>
<Color x:Key="RegionColor">#FFFAFAFA</Color>
- <BoxShadow x:Key="BoxShadow">0 1 4 #D1D1D1</BoxShadow>
+ <BoxShadows x:Key="BoxShadow">0 1 4 #D1D1D1</BoxShadows>
</Styles.Resources>
<StyleInclude Source="avares://Avalonia.Themes.Fluent/Accents/FluentLight.xaml"/>
</Styles>

BoxShadow to BoxShadows