The Protection tab in the Settings → Options window gives users the ability to protect the active worksheet or workbook completely or in relation to certain features. There are 14 options that can be selected once the Protection radio button is on.
Initially, the Protection tab is unlocked, and you can add a password and adjust the settings. This password can be used later to unlock the sheet or workbook again or change the settings.
If a sheet or workbook is locked, unlock the settings on the protections tab to change them. Choose the lock sign in the upper right corner and enter the password.
To lock the sheet or workbook again (in case a password is already entered), choose OK.
Although you unlock the protection tab settings by entering the password, the worksheet or workbook is only unprotected when you select No Protection and confirm with OK.
Note
You cannot access the Member Names tab if the workbook or sheet is protected. The tab is greyed out and a tooltip indicates why it is greyed out.If you have protected the workbook, you must unprotect the workbook first.
You cannot set the protection as default.