To extract and sort non-adjacent arrays in your data, nest the CHOOSECOLS or CHOOSEROWS functions inside your SORT or SORTBY ...

Select the columns you want to fix. In this case we’re selecting the header columns — those at the very top of the ...

Now, you can sort the copied list by clicking any cell in it and choosing Sort from the Data menu. By default, Excel selects the Header Row option. Be sure to update this option accordingly.

You don't have to add a header to every Excel worksheet individually when you can group them first.