Hello,
Thank you for contacting Rank Math today.
Google does not honor Meta Keywords for quite a long now so we never added the option to display them in the front-end source code in the plugin.
You can read more about that here:
https://webmasters.googleblog.com/2009/09/google-does-not-use-keywords-meta-tag.html
But if you still want to display the keyword meta, please add the following filter to your functions.php:
/**
* Add <meta name="keywords" content="focus keywords">.
*/
add_filter( 'rank_math/frontend/show_keywords', '__return_true');
Hope that helps. If you have any further question(s), please let us know. Thank you.
