Removed header from group product grid

Author: saphaljha

app/code/Magento/GroupedProduct/Ui/DataProvider/Product/Form/Modifier/Grouped.php

@@ -562,6 +562,7 @@ protected function fillMeta()
                             'fit' => true,
                             'label' => __('Thumbnail'),
                             'sortOrder' => 20,
+                            'labelVisible' => false,
                         ],
                     ],
                 ],
@@ -586,6 +587,7 @@ protected function fillMeta()
                             'validation' => [
                                 'validate-number' => true,
                             ],
+                            'labelVisible' => false,
                         ],
                     ],
                 ],
@@ -601,7 +603,8 @@ protected function fillMeta()
                             'elementTmpl' => 'Magento_GroupedProduct/components/position',
                             'sortOrder' => 90,
                             'fit' => true,
-                            'dataScope' => 'positionCalculated'
+                            'dataScope' => 'positionCalculated',
+                            'labelVisible' => false,
                         ],
                     ],
                 ],
@@ -660,6 +663,7 @@ protected function getTextColumn($dataScope, $fit, Phrase $label, $sortOrder)
                         'fit' => $fit,
                         'label' => $label,
                         'sortOrder' => $sortOrder,
+                        'labelVisible' => false,
                     ],
                 ],
             ],