1. Position your cursor so that it is on one of the sheet tabs at the bottom of the screen. Make sure the sheet tab is highlighted.
2. Right-click the sheet tab. Choose 'Ungroup Sheets' from the drop-down menu.
3. Click one of the menus. All of the options should now be visible. If the options are still grayed out, right-click the sheet tab again and choose 'Ungroup Sheets.'