dont add fixed dimensions on NavBarItem.axaml
MODIFY
WalletWasabi.Fluent/Controls/NavBarItem.axaml
WalletWasabi.Fluent/Controls/NavBarItem.axaml
<Setter Property="Template">
<ControlTemplate>
<!-- The margin here should be compensated with the same amount in the NavBar's topmost content-->
- <Panel Margin="5" Height="60" Width="60" ClipToBounds="False">
+ <Panel Margin="5"
+ Height="{TemplateBinding Height}"
+ Width="{TemplateBinding Width}"
+ ClipToBounds="False">
<Border Name="SelectionBackground" />
<ContentPresenter Name="PART_ContentPresenter"
+ Height="{TemplateBinding Height}"
+ Width="{TemplateBinding Width}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"

dont add fixed dimensions on NavBarItem.axaml