My Wordpress websites are not using single.php to show posts on the website. Every time I open a post, it opens it in index.php.
My single.php looks like this
<?php get_header(); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<? echo the_content(); ?>
<? endwhile;
endif; ?>
<? get_footer();
?>
How can I fix this?