Ribbon就是一个Ribbon，你不应该禁用它的功能，如果你的“Ribbon”真的看起来像这样，考虑使用工具栏。
也就是说，您可以通过在所有层次结构级别上的所有控件上将上下文菜单设置为null来禁用它们：

<Ribbon ContextMenu="{x:Null}">
    <RibbonTab Header="abc" ContextMenu="{x:Null}">
        <RibbonGroup Header="abc" ContextMenu="{x:Null}">
            <RibbonButton Content="abc" ContextMenu="{x:Null}"/>
        </RibbonGroup>
    </RibbonTab>
</Ribbon>

您可以为所有功能区项目添加样式到app.xaml Under<Application.Resources>。请参见下面的示例。

<Application.Resources>
    <ContextMenu x:Key="HiddenContextMenu" Visibility="Hidden"/>
    <Style TargetType="Ribbon">
        <Setter Property="Ribbon.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonTab">
        <Setter Property="RibbonTab.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonGroup">
        <Setter Property="RibbonGroup.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonButton">
        <Setter Property="RibbonButton.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonRadioButton">
        <Setter Property="RibbonRadioButton.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonTextBox">
        <Setter Property="RibbonTextBox.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
    <Style TargetType="RibbonComboBox">
        <Setter Property="RibbonComboBox.ContextMenu" Value="{StaticResource HiddenContextMenu}"/>
    </Style>
</Application.Resources>