The excerpt in the post templates of the Toggle Post Filter, Dynamic Post Filter and Post List is taken from one of two places:
- The excerpt that you created with the post.
- If the post doesn’t have an excerpt, it is take from the beginning of the post content.
You can change the excerpt length manually with a line of code.
Add to the file functions.php of your child theme:
add_filter( 'excerpt_length', function() {return 20;});
Replace “20” by the required number of words.