When I rightclick on the bottom bar on one sheet-indicator the option says "Protect Sheet". If the sheet is already protected the option still says "Protect Sheet". This is quite confusing, the option should change to "Unset Sheet-Protection" or "Unlock Sheet" or something like that.
When the sheet is protected, there is a check mark next to the menu entry that make clear the state protected or unprotected of the sheet. Additionally, this menu entry terminates with suspension points; that means this entry open a dialog. It would be weird to change to name of a dialog. So closing as NotABug. Best regards. JBF