To change your editing language in Word for Mac or PowerPoint for Mac, go to Tools > Language, select your language, and select OK. To make it the default for all new documents select Default.

Adding an input language lets you set a language-preference order for websites and apps, as well as change your keyboard language. Select Start > Settings > Time & language > Language & region.

You can use the Office language options to add a language or to choose the language in which the Help and ScreenTips display. The language options are in the Set the Office Language Preferences dialog …

If you need to add text that's in a language other than the one you normally use, Office can help check spelling and grammar for you. Receive basic guidance in more than 20 languages, and spelling …

Set the region, device language, and spoken language for your products and services.

After you have enabled the keyboard language that you want, open your document and place the cursor in the document where you want to start to type text in a different language.

At the top corner of your screen, select Settings to open the Settings pane, then select Change your language. Under Display Language, select the pencil icon, then select your language from the list.

Words that are spelled the same way in several languages, such as "centre" in English (United Kingdom) and French (France), might cause incorrect language identification. To solve this problem, …

See Change your display language in Microsoft 365 for more information. The features described in this article depend on whether your organization has set up or customized personal sites and user profiles.

Set the default language for the Office programs to any language supported by your version of Windows.