hide free level from members and premium level from non-members.

hide-free-levels-for-members.php

<?php

// Add this code below to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/

function adjusting_the_pmpro_levels_array( $levels ) {

	if( !pmpro_hasMembershipLevel() ) {
		unset( $levels[1] ); // hide premium level for non-members.
	}else{
		unset( $levels[2] ); // hide free level for members.
	}

	return $levels;
}
add_filter( 'pmpro_levels_array', 'adjusting_the_pmpro_levels_array' );