MaPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:editors="clr-namespace:Syncfusion.Maui.Inputs;assembly=Syncfusion.Maui.Inputs"
             x:Class="MauApp.MaPage"
             x:Name="this"
             BindingContext="{x:Reference this}">

    <StackLayout>
        <editors:SfComboBox x:Name="comboBox" 
                    WidthRequest="250"
                    DisplayMemberPath = "Name"
                    TextMemberPath = "Name"
                    ItemsSource="{Binding SocialMedias}" />

        <editors:SfAutocomplete x:Name="autocomplete"
                        WidthRequest="250" 
                        DisplayMemberPath = "Name"
                        TextMemberPath = "Name"
                        ItemsSource="{Binding SocialMedias}" />
    </StackLayout>

</ContentPage>