Uncheck the “Detect language automatically” and “Do not check spelling or grammar” boxes. Click on Language and Set Proofing Language. How do I turn off Do not check spelling or grammar? Check the box next to Hide spelling errors in this document only and Hide grammar errors in this document only, then click OK. On the left side of the dialog box, select Proofing. To hide spelling and grammar errors in a document: Click the File tab to go to Backstage view, then click Options. How do I make Word not show spelling errors?