The Kunena team has announce the arrival of Kunena 6.3.7 [K 6.3.7] in stable which is now available for download as a native Joomla extension for J! 4.4.x/5.0.x/5.1.x/5.2.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 and issues discovered during the last development stages of K 6.3 Note: Please go to the Kunena Dashboard after an upgrade so that the Kunena database tables are also updated.
There is no setting option for this but you can do it with template overrides.
www.kunena.org/docs/en/faq/template-overrides
Copy the default.php (path is "components/com_kunena/template/crypsis/layouts/search/form/default.php" to your "Joomla template/html/com_kunena\layouts/search/form" and comment out the unwanted tables at the beginning with <!-- and at the end with -->
Important! Always create a backup before you make any changes to your website!