Written by Allen Wyatt (last updated October 22, 2022)
This tip applies to Excel 2007, 2010, 2013, 2016, 2019, Excel in Microsoft 365, and 2021
Uma has a workbook that contains six worksheets. She would like to add at least two more worksheets, but for some reason the plus sign to the right of the worksheet names (the tabs at the bottom of the program window) is grayed out. Uma wonders what would cause the plus sign to be unavailable.
The most likely cause of this behavior is that the workbook's structure has been protected. You can check if this is the case by displaying the File tab of the ribbon and then clicking Info at the left side of the screen. (See Figure 1.)
Figure 1. Info for the current workbook.
If the Protect Workbook area shows as yellow, then the workbook's structure has been protected. This means you won't be able to do rather routine tasks, such as adding or deleting worksheets. You can try to unprotect the workbook by clicking the Review tab of the ribbon. In the Protect group, the Protect Workbook tool should be shaded to show it is selected (the workbook is protected). Click the tool and the protection is removed. If you see the Unprotect Workbook dialog box (See Figure 2.) , then that means you need to enter the password used to protect the workbook.
Figure 2. Unprotecting a workbook that uses a password.
Once you unprotect a workbook, then you should either save the workbook or select a different worksheet in the workbook. That will get Excel's attention so that it realizes you just unprotected the workbook. It is at that point that the plus sign next to the worksheet tabs will be available.
If, at some point, you want to reprotect the workbook, simply follow the steps in this tip.
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