I'd like to unmerge all the cells of my google spreadsheet using script. I believe that VBA has this option (cells.unmerge) but I can't find a similar operation in GAS. I've tried this script but it didn't seem to work.
function MyFunction() {
var Sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
var Range = Sheet.getDataRange().activate();
Range.clearFormat();
}