How about require a user to enter a password.
This code will hide/unhide a sheet as needed. When you click on the button it will prompt you for a password then open if correct, when you click it again it will rehide the sheet.
Add a command button to a sheet and then right click it, click on view code and place this code into it. Make sure to change the command button name/number as needed and also change the sheet name/number accordingly. just make sure to password protect the VBA Project in the VBE so that the user cannot look at the code for the password.
Hope this will help.
Larry
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