Here are some steps you can take to try and delete a sheet in your Excel workbook:

1. Check if the sheet you want to delete is protected
2. If it is protected, attempt to unprotect it
3. If it still does not allow you to delete it, check if it is shared
4. If it is shared, try unsharing it
5. If the sheet still wont allow you to delete it, it may be a system sheet – these cannot be deleted