Button 'Reset Grid' works but doesn't appear

Can anyone help me why my “Reset Grid” doesn’t appear? He’s working

<div id="ajaxCrudDatatable">

    <?=GridView::widget([

        'id'=>'crud-datatable',

        'dataProvider' => $dataProvider,

        'filterModel' => $searchModel,

        'pjax'=>true,

        'columns' => require(__DIR__.'/_columns.php'),

        'toolbar'=> [

            ['content'=>

                Html::a(Yii::t('yii2-ajaxcrud', 'Create New'), ['create'],

                ['role'=>'modal-remote','title'=> Yii::t('yii2-ajaxcrud', 'Create New').' Estabelecimentos','class'=>'btn btn-outline-primary']).

                Html::a('<i class="fa fa-trash"></i>', [''],

                ['data-pjax'=>1, 'class'=>'btn btn-outline-success', 'title' => Yii::t('app', 'Reset Grid')]).

                '{toggleData}'.

                '{export}'

            ],

        ],          

        'striped' => true,

        'condensed' => true,

        'responsive' => true,          

        'panel' => [

            'type' => 'default', 

            'heading' => '<i class="fa fa-list"></i> <b>'.$this->title.'</b>',

            'before'=>'<em>* '.Yii::t('yii2-ajaxcrud', 'Resize Column').'</em>',

            'after'=>BulkButtonWidget::widget([

                        'buttons'=>Html::a('<i class="fa fa-trash"></i>&nbsp; '.Yii::t('yii2-ajaxcrud', 'Delete All'),

                            ["bulkdelete"] ,

                            [

                                "class"=>"btn btn-danger btn-xs",

                                'role'=>'modal-remote-bulk',

                                'data-confirm'=>false, 'data-method'=>false,// for overide yii data api

                                'data-request-method'=>'post',

                                'data-confirm-title' => Yii::t('yii2-ajaxcrud', 'Delete'),

                                'data-confirm-message' => Yii::t('yii2-ajaxcrud', 'Delete Confirm')

                            ]),

                    ]).                        

                    '<div class="clearfix"></div>',

        ]

    ])?>

</div>

when i pass the mouse over i can see it

image

very difficult to understand. Please. explain in details to get meaningful help!