Hello @Raffaele Battipaglia

We can provide a possible workaround using the available APIs since this is something that the OS Data Grid doesn’t offer it directly.

• In the Grid OnInitialize event, add a JavaScript node with the following script:
  
  

  OutSystems.GridAPI.GridManager.GetGridById($parameters.GridWidgetId).features.export.exportToExcel = 
      function (withStyles, filename) {
          this._resetPagination();
          if (this._hasLoadingMessage) {
              this._showLoadingMessage();
          }
          setTimeout(() => {
              const params = {
                  includeColumnHeaders: true,
                  includeRowHeaders: true,
                  includeStyles: withStyles,
                  formatItem: this.exportFormatItem,
                  includeColumns: function(column) { return (column.binding != "Id" && column.binding != "Rate" && column.binding != "Description") }
  
  
              };
              const book = wijmo.grid.xlsx.FlexGridXlsxConverter.save(this._grid.provider, params);
              book.sheets[0].name = 'DataGrid Data';
              book.save(this._handleFilename(filename, false));
              this._reApplyPagination();
              if (this._hasLoadingMessage) {
                  this._removeLoadingMessage();
              }
          }, 10);
      }
  		

Hope it helps!

Cheers,
GM

One of my collegues suggested a possible solution that, for the moment, seems to work.
I'll leave it here as a solution for future references, but keep in mind that it uses a protected property of the Grid.provider.itemsSource class.

Assuming the DataGrid is fed by a StructureX List, where StructureX holds all the columns that are shown in the DataGrid, the following JS retrieve all the data inside the filtered grid as a JSON:

The result is then Deserialized:

From here, you can just get the IDs or other informations needed to perform more advanced tasks from the List.

I hope this can help while finding a better solution.