You can add it using a Code snippets plugin or in your theme’s functions.php file. Once it is active, the PayPal Package Tracking section should no longer appear on orders.
Select Run Everywhere for this PHP snippet. That will ensure the filter is active when you open an order in the WordPress admin area. Front End Only and Site Wide Body are not suitable for this.
Save and activate the snippet, then refresh the order page. The PayPal Package Tracking section should disappear.
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