This is well beyond my ability to understand — the template with the plugin is archive.php, but there’s no “the_excerpt” or “the_content” in that file. It also calls the following…
themes/clean-journal-child/functions.php
themes/clean-journal/content.php
themes/clean-journal/footer.php
themes/clean-journal/functions.php
themes/clean-journal/header.php
themes/clean-journal/inc/clean-journal-breadcrumb.php
themes/clean-journal/inc/clean-journal-core.php
themes/clean-journal/inc/clean-journal-custom-header.php
themes/clean-journal/inc/clean-journal-default-options.php
themes/clean-journal/inc/clean-journal-featured-content.php
themes/clean-journal/inc/clean-journal-featured-slider.php
themes/clean-journal/inc/clean-journal-menus.php
themes/clean-journal/inc/clean-journal-metabox.php
themes/clean-journal/inc/clean-journal-social-icons.php
themes/clean-journal/inc/clean-journal-structure.php
themes/clean-journal/inc/clean-journal-widgets.php
themes/clean-journal/inc/customizer-includes/clean-journal-customizer-active-callbacks.php
themes/clean-journal/inc/customizer-includes/clean-journal-customizer-sanitize-functions.php
themes/clean-journal/inc/customizer-includes/clean-journal-customizer.php
themes/clean-journal/searchform.php
themes/clean-journal/sidebar-footer.php
themes/clean-journal/sidebar.php
When I search the directory for “the_excerpt,” it appears in
clean-journal-core.php
clean-journal-featured-content.php
clean-journal-featured-slider.php
content.php
In content.php, the only use of the_excerpt seems to be for search results:
if ( is_search() || 'full-content' != $options['content_layout'] ) : // Only display Excerpts for Search and if 'full-content' is not selected ?>
<div class="entry-summary">
<?php the_excerpt(); ?>
</div><!-- .entry-summary -->
<?php else : ?>
<div class="entry-content">
<?php the_content(); ?>
<?php
wp_link_pages( array(
'before' => '<div class="page-links"><span class="pages">' . __( 'Pages:', 'clean-journal' ) . '</span>',
'after' => '</div>',
'link_before' => '<span>',
'link_after' => '</span>',
) );
?>
</div><!-- .entry-content -->
<?php endif; ?>
…and there’s only one “the_excerpt” in -core, and it is actually part of a bigger variable name. I’ve put the core file here:
https://dumptext.com/wZqqCGqS
and to my (not very good at this) eyes, it looks like maybe the excerpt is determined by a function instead of by the_excerpt?