If the sheet tabs are not showing in your Excel workbook, you can easily bring them back by following these steps:
For Excel on Windows:
Check if Sheet Tabs are Enabled:
Go to the File menu and select Options.
In the Excel Options dialog box, select the Advanced category.
Scroll down to the Display options for this workbook section.
Ensure that the Show sheet tabs checkbox is checked.
Check Window Settings:
If the sheet tabs are still not visible, it might be because the Excel window is not maximized. Ensure that the window is maximized and that there are no hidden or minimized windows.