AppSAV/MauiApp1/AppShell.xaml

<?xml version="1.0" encoding="UTF-8" ?>
<Shell
    x:Class="MauiApp1.AppShell"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:views="clr-namespace:MauiApp1.Views"
    xmlns:local="clr-namespace:MauiApp1"
    Shell.FlyoutBehavior="Disabled"
    Title="MauiApp1">

    <ShellContent
        Title="Home"
        ContentTemplate="{DataTemplate local:MainPage}"
        Route="MainPage" />
        
    <TabBar>
        <ShellContent Title="Accueil" ContentTemplate="{DataTemplate local:MainPage}" />
        <ShellContent Title="Fournisseurs" ContentTemplate="{DataTemplate views:FournisseurPage}" />
    </TabBar>

    <FlyoutItem Title="Fournisseurs" FlyoutDisplayOptions="AsSingleItem">
        <ShellContent Route="fournisseurpage" ContentTemplate="{DataTemplate views:FournisseurPage}" />
    </FlyoutItem>

</Shell>