to adjust the report to your own needs you can use the following action hook
/* export your own report if you want */
do_action('wppizza_custom_report', $dataset);
which can be found in inc/admin.report.functions.php
i would suggest you copy the wppizza_report_export
function in it’s entirety (without that action hook or you’ll end up in an infinite loop), rename it to a function name of your choosing , adkust waht you want to output, and use the action hook to run this on export
there are already to constanst you could define like so in your wp-config.php
define('WPPIZZA_OMIT_REPORT_GATEWAYS_SUMMARY', true)
define('WPPIZZA_OMIT_REPORT_ORDER_STATUS_SUMMARY', true)
which would already omit those 2 summaries from your report(s)