Disabled Taxes in PrestaShop, but Store Manager keeps showing taxes. Why?

In PrestaShop, disabling taxes globally via the Back Office (International > Taxes > Enable tax = No) does not automatically purge or nullify existing tax associations inside the database.

Instead, PrestaShop leaves historical data intact so that your old orders, invoices, and product structures don't break.
At the same time if the product has tax class is still assigned to the product, it will be shown in Store Manager. 

In order to remove taxes completely, please delete the tax data from the database completely (unassign from products, orders and delete the tax class and tax rates).