即使没有安装任何插件，我也可以在默认的2616主题中看到上一个–下一个图像选项。

但我想使用蓝色大主题而不是默认主题，我无法看到上一个–下一个图像选项，无论我安装了不同的插件相关的图库，如图库公文包、NextGEN图库、PB SEO友好图像……

需要做些什么才能看到蓝色大屏幕或任何其他（不仅仅是默认）主题中的“上一张–下一张”图像选项？

谢谢

//已编辑//单个。php

<?php
/**
 * The template for displaying all single posts.
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
 *
 * @package Big Blue
 */

get_header(); ?>

    <header class="entry-header article-header <?php if(has_post_thumbnail()){echo \'featured-image\'; } ?>">
        <?php the_post_thumbnail( \'single-post-thumbnail\', array( \'class\' => \'single-post-thumbnail\' ) ); ?>
        <div class="blue-overlay"></div>
        <div class="container">
            <div class="entry-detail">
                <?php the_title( \'<h1 class="entry-title">\', \'</h1>\' ); ?>
                <?php $tags_list = get_the_tag_list( \'\', esc_html__( \', \', \'big-blue\' ) ); ?>
                <div class="entry-meta">
                    <?php big_blue_posted_on(); ?> 
                </div><!-- .entry-meta -->
            </div>
        </div>

    </header><!-- .entry-header -->

    <div id="primary" class="content-area">
        <main id="main" class="site-main" role="main">
            <div class="inner-wrapper">
                <div class="container">

                    <div class="row">
                        <div class="col-md-8">
                            <?php
                            while ( have_posts() ) : the_post();

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

                                the_post_navigation();

                                // If comments are open or we have at least one comment, load up the comment template.
                                if ( comments_open() || get_comments_number() ) :
                                    comments_template();
                                endif;

                            endwhile; // End of the loop.
                            ?>
                        </div>
                        <div class="col-md-4">
                            <?php get_sidebar(); ?>
                        </div>
                    </div>

                </div>
            </div>
        </main><!-- #main -->
    </div><!-- #primary -->

<?php
get_footer();