Set HorizontalAlignment and VerticalAlignment
MODIFY
WalletWasabi.Fluent/Views/ResponsivePanelDemo/ResponsivePanelDemoView.axaml
WalletWasabi.Fluent/Views/ResponsivePanelDemo/ResponsivePanelDemoView.axaml
ItemHeight="126"
ColumnHints="1, 2, 3, 4"
WidthTriggers="228, 456, 684, 912"
+ HorizontalAlignment="Left"
+ VerticalAlignment="Top"
UseLayoutRounding="False"
Background="LightGray">
<Border CornerRadius="4" Margin="4" Background="Red" ToolTip.Tip="{Binding $self.Bounds.Size}" c:ResponsivePanel.ColumnSpan="1, 1, 1, 2" c:ResponsivePanel.RowSpan="1, 1, 1, 1" />

MODIFY
WalletWasabi.Fluent/Views/Wallets/WalletView.axaml
WalletWasabi.Fluent/Views/Wallets/WalletView.axaml
ItemHeight="150"
ColumnHints="1, 2, 3"
WidthTriggers="300, 450, 650"
+ HorizontalAlignment="Left"
+ VerticalAlignment="Top"
UseLayoutRounding="False">
<tiles:WalletBalanceTileView
c:ResponsivePanel.ColumnSpan="1, 1, 1" c:ResponsivePanel.RowSpan="1, 1, 1" />

Set HorizontalAlignment and VerticalAlignment