I found a solution that worked for me, in the form of a slight code adjustment to Pinboard’s index.php file, in a discussion on the Pinboard template designer’s site.
https://www.onedesigns.com/support/topic/remove-slider-from-blog-page-2
There are many index.php files in my WordPress site, so make sure you edit the one in wp-content > themes > pinboard. Or do the edit using Appearance > Editor in the WordPress dashboard so that you edit the right one.