Hi there,
GP uses the standard WP Comments form.
To add pagination you would need to copy the comments.php
to a child theme:
https://github.com/tomusborne/generatepress/blob/master/comments.php
Then you’d replace this:
<div class="nav-previous"><?php previous_comments_link( __( '← Older Comments', 'generatepress' ) ); ?></div>
<div class="nav-next"><?php next_comments_link( __( 'Newer Comments →', 'generatepress' ) ); ?></div>
With this:
<?php paginate_comments_links( array('prev_text' => '‹ Previous', 'next_text' => 'Next ›')); ?>