To fix the Unknown error trying to lock file in Teams, Excel, OneDrive, PowerPoint, SharePoint, etc, Office apps use these proven solutions.

Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

If you have Excel spreadsheets with sensitive data, you can easily lock and unlock them Here's what you need to do.

The ability to lock cells or elements of Microsoft Excel and Google Sheets, but not the full sheet, allows maximum customization and control of a project.

In Word, Excel, or PowerPoint for Windows, open the file you want to protect with a password, then select File and Info. You should see a Protect option at the top of the next list: Click this ...