Export Dataset to xlsx

When I try to export dataset to excel, I do not see an option to export to xlsx, other than this being the standard format now used across enterprise and personal office versions, it also allows for a much bigger single sheet export (104K rows to 65K of xls)
Any clue why this is not available in Toad for Oracle 15?

It’s there. Set export format to excel file. If it defaults to xls then change to xlsx.