Remove Yoast Sitelinks Search Box Schema Piece

yoast-remove-searchaction.php

<?php

/**
 * Remove the SearchAction schema from the graph.
 */
add_filter( 'wpseo_schema_website', function( $website ) {
    if ( isset( $website['potentialAction'] ) && is_array( $website['potentialAction'] ) ) {
        foreach ( $website['potentialAction'] as $key => $action ) {
            if ( isset( $action['@type'] ) && $action['@type'] === 'SearchAction' ) {
                unset( $website['potentialAction'][$key] );
                break;
            }
        }
    }
    return $website;
});