Change the language of some - or all - Sharepoint Online sites

tcboeira 

Hi
When a site is created, it's too late to change language. You can only act on the display language, but onedrive and sharepoint, when created can't be changed.  personal experience, our setting was in French and after verification with microsoft support, i had to recreate some of them.

For any new sharepoint site, you can define the language on the Admin of office 365

or more easily, you create with PNP powershell and add the "LCID" parameter

New-PnPSite -Type TeamSite -Title <name> -Description <sometext> -Lcid 1033

I prefer the powershell option to create new site, as i'm sure which language is the default.

To chagne the default language for onedrive site creation, you need to contact microsoft for new account.