Someone protected workbook

[John__Boy]

I have a complicated workbook with numerous tabs that another user protected and possibly shared.  It has {Group} after the name of the workbook at the top of the workbook.  I need to make changes but nobody is owning up to changing anything.  Under the Review option in the menu, there is no option to unprotect the workbook.  anything I can do to correct this issue?

Thanks

[#2]

@John__Boy 

[Group] means that multiple sheets have been selected. Right-click any of the selected sheet tabs and select Ungroup Sheets from the context menu.

[#3]

@Hans VogelaarThanks.  That took care of the problem.  I never group tabs, so wasn't aware of this.