Hello,
The function the_title is part of wordpress, which, optionally, can pass an opening tag and closing tag as the parameters. https://developer.wordpress.org/reference/functions/the_title/
The function the_field is not part of wordpress, but from acf. and the function takes the parameter of field_name and reference. https://www.advancedcustomfields.com/resources/the_field/
So, one way to do it is handle the html yourself:
<?php if (generate_show_title()): ?>
<h1 class="entry-title" itemprop="headline">
<?php the_title(); ?>, <?php the_field('titleposition'); ?>
</h1>
<?php endif; ?>
Cheers. 😀
