CORE PANEL

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EDIT :: single.php

<?php
/**
 * The template for displaying all single posts
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
 *
 * @package WordPress
 * @subpackage Twenty_Twenty_One
 * @since Twenty Twenty-One 1.0
 */

get_header();

/* Start the Loop */
while ( have_posts() ) :
	the_post();

get_template_part( 'template-parts/content/content-single' );

if ( is_attachment() ) {
		// Parent post navigation.
		the_post_navigation(
			array(
				/* translators: %s: Parent post link. */
				'prev_text' => sprintf( __( 'Published in%s', 'twentytwentyone' ), '%title' ),
			)
		);
	}

// If comments are open or there is at least one comment, load up the comment template.
	if ( comments_open() || get_comments_number() ) {
		comments_template();
	}

// Previous/next post navigation.
	$twentytwentyone_next = is_rtl() ? twenty_twenty_one_get_icon_svg( 'ui', 'arrow_left' ) : twenty_twenty_one_get_icon_svg( 'ui', 'arrow_right' );
	$twentytwentyone_prev = is_rtl() ? twenty_twenty_one_get_icon_svg( 'ui', 'arrow_right' ) : twenty_twenty_one_get_icon_svg( 'ui', 'arrow_left' );

$twentytwentyone_next_label     = esc_html__( 'Next post', 'twentytwentyone' );
	$twentytwentyone_previous_label = esc_html__( 'Previous post', 'twentytwentyone' );

the_post_navigation(
		array(
			'next_text' => '' . $twentytwentyone_next_label . $twentytwentyone_next . '%title',
			'prev_text' => '' . $twentytwentyone_prev . $twentytwentyone_previous_label . '%title',
		)
	);
endwhile; // End of the loop.

get_footer();

CANCEL

// SYSTEM PANEL //

EDIT :: single.php