aistudio-wpf-diagram/Fluent.Ribbon/Fluent.Ribbon.Showcase/RibbonWindowWithoutRibbon.xaml

<fluent:RibbonWindow x:Class="FluentTest.RibbonWindowWithoutRibbon"
                     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                     xmlns:fluent="urn:fluent-ribbon"
                     mc:Ignorable="d"
                     Title="RibbonWindowWithoutRibbon"
                     Height="300"
                     Width="300">
    <Grid>
        <TextBlock>There is no Ribbon in this Window.</TextBlock>
    </Grid>
</fluent:RibbonWindow>