I have followed the instructions in this thread https://siteorigin.com/thread/plese-check-my-approach-to-enablig-previousnext-to-point-only-to-posts-within-a-category/ by adding the vantage_content_nav function into the functions.php file my the child theme. I have then edited the links as follows:
<div class="single-nav-wrapper">
<?php previous_post_link( '<div class="nav-previous">%link</div>', '<span class="meta-nav">' . _x( '←', 'Previous post link', 'vantage' ) . '</span> %title', true, '', 'category' ); ?>
<?php next_post_link( '<div class="nav-next">%link</div>', '%title <span class="meta-nav">' . _x( '→', 'Next post link', 'vantage' ) . '</span>', true, '', 'category' ); ?>
</div>
This adds the $in_same_term, $excluded_terms and $taxonomy parameters, but it doesn’t seem to work, links to categories outside the selected one are still displaying on a single post.