try adding adorner in between dialogs in MainView.axaml
MODIFY
WalletWasabi.Fluent/Views/MainView.axaml
WalletWasabi.Fluent/Views/MainView.axaml
</c:Dialog.Styles>
<ContentControl Content="{Binding CurrentPage}" />
</c:Dialog>
+ <c:AdornerCanvas Name="DialogAdornerCanvas" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
<c:Dialog x:CompileBindings="False"
DataContext="{Binding DialogScreen}"
IsDialogOpen="{Binding IsDialogOpen, Mode=TwoWay}"
</c:Dialog.Styles>
<ContentControl Content="{Binding CurrentPage}" />
</c:Dialog>
- <c:AdornerCanvas Name="DialogAdornerCanvas" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</Panel>
</UserControl>

try adding adorner in between dialogs in MainView.axaml