Hi KwanWong, I have ran the test and got the same result as yours. It seems the language of Office Web App is related to the default language of the SharePoint site. And the default language of the site is specified when the site is first created. Given the situation, I suggest you send feedback to the engineers team to help us improve the product. Many features of our current programs and updates were designed and upgraded based on our customers’ great and sensible feedback. Thanks, Elaine
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