|Not sure what you mean, but on the Windows toolbar, when you have multiple sheets open, the Excel icon should appear to have multiple icons "behind" it. |
Hovering your mouse over it, it should display your opened files.
If that is not the case then try this:
On the Task Bar, Click File,
Click on Advanced
Scroll down to the Display section
In the Display section, make sure the check box next to the line:
Show all windows in task bar is checked.
If that does not work, then it may be a limitation of the Starter edition