Gotcha! Bravo! Thanks T.
Follow your instruction.
1. Remove this from content-single.php.
<header class="entry-header">
<?php the_title( '<h1 class="entry-title" itemprop="headline">', '</h1>' ); ?>
<div class="entry-meta">
<?php generate_posted_on(); ?>
</div><!-- .entry-meta -->
</header><!-- .entry-header -->2. I couldn’t find –
... <h1 class="entry-title" itemprop="headline"> ...
in content.php. So I don’t remove anything from content.php.
3. Add code snippet in functions.php.
4. 🙂 🙂 I get full width title on single post / page.
Do I still need to change (add / remove) in content.php?