Can you please help us how we can add multiselect fields in addColumn?
protected function _prepareToRender() {
$this->addColumn('field_1', ['label' => __('Field 1')]);
$this->addColumn('field_2', ['label' => __('Field 2')]);
$this->addColumn('field_3', ['label' => __('Field 3')]);
$this->addColumn('field_4', ['label' => __('Field 4')]);
$this->_addAfter = FALSE;
$this->_addButtonLabel = __('Add');
}
how we can add column for multiselect fields in configuration?