I'm right-clicking on a sheet, clicking delete and nothing happens. The sheet is not protected. I'm not sure what's happening.
I'm running Excel for Office 365 MSO v1902 for Windows.
If the workbook is shared you won't be able to delete sheets. To turnoff sharing, choose Tools>Share Workbook.On the Editing tab, remove the check mark from 'Allow changes by morethan one user at the same time'Click OK
Hope that helps