Select::make using resources

Select::make('country_id')
    ->label('Country')
    ->searchable()
    ->options(Country::all()->pluck('name', 'id')->toArray())                                   
 ->reactive()
                                        ->required()
                                        ->placeholder('Select a country'),
                                         I am using the above code in my resources without selecting the country. When I given Alt + down arrow, it shows a select list with an Arrow down with countries. If I refresh the page, it is not visible,so kindly advise me anyone