Hi @shadialaghbari,
By default, our plugin saves within the order data, the store details and the PDF invoice settings you have at the moment of the document creation. This is used to avoid updating old invoices if you change your store details later, like the shop address, for instance.
In other words, if you later perform any change in these settings, it will not be updated in existing PDF invoices. This is the expected behavior for most stores, since it is a legal requirement for most tax authorities around the world.
That said, if you are just testing, there are several ways to update the PDF invoices to see your latest settings in your PDF documents. See this article from the plugin’s settings to learn more: Show PDF documents with the latest settings