Allowed html tags and class in codestar metabox feild

1.metabox.php

<?php

function lcorp_section_pricing_metabox( $metaboxes ) {
	$section_id = 0;

	if ( isset( $_REQUEST['post'] ) || isset( $_REQUEST['post_ID'] ) ) {
		$section_id = empty( $_REQUEST['post_ID'] ) ? $_REQUEST['post'] : $_REQUEST['post_ID'];
	}

	if ( 'section' != get_post_type( $section_id ) ) {
		return $metaboxes;
	}

	$section_meta = get_post_meta( $section_id, 'lcorp-section-type', true );
	if ( ! $section_meta ) {
		return $metaboxes;
	} else if ( 'pricing' != $section_meta['section-type'] ) {
		return $metaboxes;
	}

	$metaboxes[] = array(
		'id'        => 'lcorp-pricing-section',
		'title'     => __( 'Pricing Section Settings', 'lcorp' ),
		'post_type' => 'section',
		'context'   => 'normal',
		'priority'  => 'default',
		'sections'  => array(
			array(
				'name'   => 'lcorp-pricing',
				'icon'   => 'fa fa-image',
				'fields' => array(
					array(
						'id'    => 'section_heading',
						'type'  => 'text',
						'title' => __( 'Section Heading', 'lcorp' ),
                        'default' => __( 'Pricing made', 'lcorp' ),
						'sanitize'=> false,
					),
				)
			)
		)
	);

	return $metaboxes;
}

add_filter( 'cs_metabox_options', 'lcorp_section_pricing_metabox' );

2.retrieve-metabox-data.php

<h2 class="display-3 mb-4">
    <?php
        if (!empty($lcorp_section_meta['section_heading'])) {
            $content = $lcorp_section_meta['section_heading'];
            // Use a regular expression to add the class to the span tag
            $content_with_class = preg_replace('/<span([^>]*)>/', '<span$1 class="text-underline-warning">', $content);

            echo $content_with_class;
        }
    ?>
</h2>

Metabox

Retrieve metabox data