A Microsoft file hosting and synchronization service.
Hi Md. Jafor Ikbal,
Thanks for posting your concern here in Microsoft Community!
The best way to set the display language in Office for the web is to set the language in the host where your documents live. That's usually OneDrive, SharePoint, Dropbox, etc. When you open a document from one of those sites, Office Online will use the display language you have that service set to.
To get the best assistance, we strongly recommend submitting your concern to our OneDrive Email support. Please follow these steps: Sign in to **onedrive.com** using any browser. Click the "?" icon (Help icon) on the top banner of the page. Select Email OneDrive Support, submit your concern and then follow the prompts to request support.
You can also visit OneDrive Help Center for additional help.
To notify us and have us get back to you, simply reply to this post.