magento2 – Magento 2 How to change the Tracking Information Shipment # to Order # in Tracking Popup

The tracking popup shows shipment # and I want to change it to the order number. I have found this answer for Magento 1:

$_order = Mage::getModel('sales/order')->load($this->getOrderId());

But I don’t know how to use this in Magento 2.

Can someone tell me how to use it?