Open "imports/theme.nss" and change dark option to default or auto

dark = default

Save changes, press CTRL + RIGHT-CLICK to reload settings.

function myFunction() {
  let sheetData = SpreadsheetApp.getActiveSpreadsheet()
    .getSheetByName("Data")
    .getDataRange()
    .getValues();

  for (let i = 1; i < sheetData.length; i++) {
    Logger.log(sheetData[i][0]);
  }

  SpreadsheetApp.getActiveSpreadsheet()
    .getSheetByName("Data")
    .getDataRange()
    .setValues(sheetData);
}