@Gayu
This cannot be manually deleted and hence cannot be deleted via PAD too, because it is an Excel table.
But I understand your intention is to make them as column headers.
So you can copy paste your headers already present from Row No 2 to Row No 1
and then delete Row No 2.
Like this...
Original:

After copy pasting row 2 into row 1

Then after deleting row 2
