Conditionally show a section in Oxygen based on if the CPT has posts attached to it via post object field.Links CPT's and display on frontend using post object field - https://gist.github.com/tdrayson/0b915b4d89615ca663f2bd1f03e0f364Add condition

Relationship_field_is_not_empty.php

function check_query_field( $cpt_name, $acf_field ){ //Put CPT as function name
    
    //WP_Query arguments
    $args = array(
        'post_type'     => array( $cpt_name ),//CPT NAME Here
        'meta_query'    => array(
            array(
                'key'     => $acf_field, //ACF FIELD NAME HERE
                'value'   => get_the_ID(),
                'compare' => 'LIKE',
            ),
        ),
    );

    // The Query
    $query = new WP_Query( $args );

    if ( ! ( $query->have_posts() ) ) {
      return 1;
    } else {
        return 0;
    }

}

// Add condition - Dynamic Data -> PHP Function Return Value -> Function name = check_query_field
// In Function Arguments - CPT_NAME, ACF_FIELD_NAME
// Set Dynamic data == 0