В контроллер admin/controller/catalog/product.php
после
$data['action'] = $this->url->link('catalog/product/edit', 'token=' . $this->session->data['token'] . '&product_id=' . $this->request->get['product_id'] . $url, true);
добавить
$data['product_page'] = HTTP_CATALOG.'index.php?route=product/product&product_id='.$this->request->get['product_id'];
в шаблон admin/view/template/product_form.tpl
перед
<button type="submit" form="form-product" data-toggle="tooltip" title="<?php echo $button_save; ?>" class="btn btn-primary"><i class="fa fa-save"></i></button>
добавить
<?php if (isset($product_page)) { ?><a class="btn btn-info" href="<?php echo $product_page; ?>" target="_blank" data-toggle="tooltip" title="<?php echo $button_view; ?>"><i class="fa fa-eye"></i></a><?php } ?>