Filter to change the filename of the exported .XLSX file and to remove the first row containing the document title

gv-datables-excel-export.php

<?php // MAKE SURE TO REMOVE THIS FIRST LINE BEFORE COPYING THIS CODE TO YOUR FUNCTIONS.PHP FILE

add_filter('gravityview/datatables/button_excel','gravityview_excel_export_settings', 10 ,2);
function gravityview_excel_export_settings( $button_config = array(), $view_id){
	$button_config['filename'] = 'dt-excel-test'; //you can change the filename here (don't type the extension)
	$button_config['title'] = '';
    return $button_config;
}