taxonomy-meta-box-without-adder.php

<?php
/**
 * Displays a custom taxonomy meta box without adder.
 *
 * @param WP_Post $post Current post object.
 * @param array $box Categories meta box arguments.
 * @return void
 */
function toms_custom_meta_box_without_adder( WP_Post $post, array $box ): void {
	$tax_name = esc_attr( $box['args']['taxonomy'] );
	?>
	<div id="taxonomy-<?php echo $tax_name; ?>" class="categorydiv toms-custom-meta-box">
		<?php echo "<input type='hidden' name='tax_input[' . $tax_name . ']' value='0' />"; ?>
		<ul id="<?php echo $tax_name; ?>checklist" data-wp-lists="list:<?php echo $tax_name; ?>" class="categorychecklist form-no-clear">
			<?php wp_terms_checklist( $post->ID, array( 'taxonomy' => $tax_name ) ); ?>
		</ul>
	</div>
	<?php
}