Wix Invoices Request: Changing the Language of Individual Invoices
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Currently, in Wix Invoices, it is not possible to switch languages for each invoice you create. You can temporarily change your account language in the Language & region settings of your site's dashboard. However, this affects the language of all your invoices, so make sure to change it back after you've created an invoice in another language.
We are always working to update and improve our products, and your feedback is greatly appreciated.