Elementor content conforms to page assigned Paid Memberships Pro membership levels - /elementor/includes/frontend.php L315

frontend.php

public function apply_builder_in_content( $content ) {
		if ( ! $this->_is_frontend_mode )
			return $content;

		$post_id = get_the_ID();
		if ( post_password_required( $post_id ) )
			return $content;

		$data = Plugin::instance()->db->get_plain_editor( $post_id );
		$edit_mode = Plugin::instance()->db->get_edit_mode( $post_id );

		if ( empty( $data ) || 'builder' !== $edit_mode )
			return $content;
			
		/* custom code to filter paid membership pro */
		$hasaccess = pmpro_has_membership_access(NULL, NULL, true);
        if(is_array($hasaccess)){
            //returned an array to give us the membership level values
            //$post_membership_levels_ids = $hasaccess[1]; //gives us all level ids
            //$post_membership_levels_names = $hasaccess[2]; //gives us the level names
            $hasaccess = $hasaccess[0];
        }
        
        if($hasaccess){
            ob_start(); ?>
    		<div id="elementor" class="elementor">
    			<div id="elementor-inner">
    				<div id="elementor-section-wrap">
    					<?php $this->_print_sections( $data ); ?>
    				</div>
    			</div>
    		</div>
    		<?php
    		return apply_filters( 'elementor/frontend/the_content', ob_get_clean() );   
        } else {

    		ob_start(); ?>
    		<div id="elementor" class="elementor container">
    			<div id="elementor-inner">
    				<div id="elementor-section-wrap">
    					<div class="pmpro_content_message"><br><br>This content is for GoFit Concepts Monthly Program members only.<br><a href="<?php echo wp_login_url( get_permalink() ) ?>">Log In</a> <a href="<?php echo esc_url( wp_registration_url() ); ?>"><?php esc_html_e( 'Register', 'textdomain' ); ?></a></div>
    				</div>
    			</div>
    		</div>
    		<?php
    		return apply_filters( 'elementor/frontend/the_content', ob_get_clean() );
        }
	}

from functions.php -

add_filter( 'elementor/frontend/the_content', function ( $content ) {
  /****
   * Your if / else or whatever goes here to determine what
   * modifications to $content is necessary or not, then don't
   * forget to return $content
   ************************************/
});