This command opens a dialog where you can assign a different name to the current sheet.
To access this command...
Choose Sheet - Rename Sheet.
Enter a new name for the sheet here.
You can also open the Rename Sheet dialog through the context menu by positioning the mouse pointer over a sheet tab at the bottom of the window and clicking while pressing Ctrl clicking the right mouse button.
Alternatively, click the sheet tab while pressing the Command Alt key. Now you can change the name directly. The availability of this function depends on your X Window Manager.