PicView/src/PicView.Avalonia.MacOS/Views/MacMainWindow.axaml

<Window
    BorderBrush="{StaticResource SecondaryBackgroundColor}"
    BorderThickness="1"
    ExtendClientAreaChromeHints="SystemChrome"
    ExtendClientAreaTitleBarHeightHint="28"
    Icon="avares://PicView.Avalonia/Assets/icon.icns"
    MinHeight="400"
    MinWidth="435"
    Title="PicView MacOS"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d"
    x:Class="PicView.Avalonia.MacOS.Views.MacMainWindow"
    xmlns="https://github.com/avaloniaui"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:views="clr-namespace:PicView.Avalonia.Views;assembly=PicView.Avalonia"
    xmlns:views1="clr-namespace:PicView.Avalonia.MacOS.Views"
    xmlns:vm="using:PicView.Avalonia.ViewModels"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:uc="clr-namespace:PicView.Avalonia.Views.UC;assembly=PicView.Avalonia">
    <DockPanel LastChildFill="True">
        <views1:MacOSTitlebar DockPanel.Dock="Top" />
        <uc:BottomBar DockPanel.Dock="Bottom" />
        <views:MainView />
    </DockPanel>
</Window>