By default, the Partner System interface displays in a set language, but you can change it to your preferred language at any time.
To change the interface language:
In the Partner System, click on your name in the bottom-left corner.
Select My Account.
Find the Preferences section.
Select your preferred language from the list.
The interface will update immediately and start displaying in the language you selected.
This setting only changes the language of the Partner System interface itself. It does not affect the language your customers see during checkout.
That's controlled separately by the Products default locale setting in Partner System, which determines the default language of your payment flow (e.g., during redirect to payment). If your store passes its own language during checkout, that can override the default; browsers may also remember the last language used.
If you have additional questions and need our help, feel free to contact our support team or via the chat in the bottom right corner.