Thank you for reply.
I want to make Autocomplete and 2 Buttons in one line. so I need to set Horizontal for Stacklayout.
But don't worry I already solved this problem like this. If any better solution, please let me know.
Thanks,
<StackLayout Orientation="Horizontal" Padding="7,5,5,0" x:Name="autocompleteStack" >
<StackLayout HorizontalOptions="StartAndExpand" VerticalOptions="Start">
<autocomplete:SfAutoComplete HeightRequest="40" x:Name="autoComplete" />
</StackLayout>
<Button x:Name="viewModeChangeBtn" VerticalOptions="Start" WidthRequest="50" HeightRequest="40" TextColor="White" BackgroundColor="#F8B4C3"
Text="List" />
<Button x:Name="viewFilterBtn" VerticalOptions="Start" WidthRequest="50" HeightRequest="40" TextColor="White" BackgroundColor="#F8B4C3"
Text="Filter" />
</StackLayout>
private void AutocompleteStack_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "Width")
autoComplete.WidthRequest = autocompleteStack.Width - 125;
}