One suggestion to Excel Group and Ungroup function
Hello! As an active Excel user, I have noted one possible useful addition to the functionality of Excel sheets. When demonstrating presentations and having some lines/columns grouped and hidden on the active sheet it would be useful to have an option to set a password for unhiding lines/columns with secret information (for example salary details). We had some occasions when such information was opened just by unintentionally tapping on (+) sign near the hided grouped raws.