Spreadsheet Widget. Can I change/edit the name of the columns? Renaming the A,B and C.

It is possible to replace the text of column headers on the Spreadsheet widget using CSS

Here is an example of replacing the text of the A column header:

#col_A {
   text-indent: -9999px;
   line-height: 0;
}

#col_A:after {
  content: 'whatever it is you want to add';
  text-indent: 0;
  display: block;
 line-height: initial;
}

Saving this CSS inside your widget will show this:

Feel free to let us know if you have questions or if you need assistance.

Thanks.