The `pmpro_levels_array` gives you the opportunity to adjust how your Levels array winds up being output to screen.

pmpro-adjusting-levels-array.php

<?php // Do not include in Customizations plugin
/**
 * pmpro_levels_array This filter allows us to alter what winds up as the Levels array
 *
 * @param  array $levels The array created in admin
 *
 * @return array         Output of the array
 */
function adjusting_the_pmpro_levels_array( $levels ) {
	$newlevels = array();

	foreach ( $levels as $level ) {
		if ( ! pmpro_isLevelFree( $level ) ) {
			$newlevels[] = $level;
		}
	}
	return $newlevels;
}
add_filter( 'pmpro_levels_array', 'adjusting_the_pmpro_levels_array' );

This recipe is included in the blog post on "Hide Free Levels From the Membership Levels Page" at Paid Memberships Pro here: https://www.paidmembershipspro.com/hide-free-levels-from-the-membership-levels-page/