With the Excel file open select File in the top-left corner of the screen, followed by Info. Select Protect Workbook, then choose Encrypt with Password.

When a worksheet is hidden using `xlSheetVeryHidden`, it cannot be made visible again through the Excel user interface, adding an additional layer of protection to your sensitive data.

Open the spreadsheet you want to protect in Excel, click the "Review" tab and then click "Protect Sheet" in the Changes group to display the Protect Sheet dialog. The "Protect worksheet and ...

Open the Excel file you want to protect with a password. Click on File -> Info. Now select Protect Workbook. Select Encrypt with Password from the list. Now enter the password. Confirm it once ...

You worked hard to put that Excel sheet together, now protect it from unintended damage.