Workbook - Lock User Interface

You can access the Lock User Interface function in the following ways:

Ribbon bar: Select the Workbook tab. In the Tools group, click Lock User Interface to display the Lock User Interface dialog box.
Classic menus: On the Workbook menu, select Lock User Interface to display the Lock User Interface dialog box.

You can also right-click in a workbook and select Lock User Interface from the shortcut menu to access the Lock User Interface dialog box.