it's because it's locked.
In Layout Mode, select the tabbed item. Then go to Arrange and select Unlock.
then double click on the tabbed item and you will be able to rename the tabs.
Thanks. That did it. I thought it would be something like that, I just didn't know where to find it.
Richard, I'm a church musician looking for a good way to catalogue my church's vast music library. Would you be willing to share your Filemaker database, please?