I just figured out the answer to my own question. The answer here (https://www.ads-software.com/support/topic/removing-floating-share-buttons-from-posts-page/) applies; however, the actual code depends on your theme. I was using a custom theme, wherein I had not activated dynamic body classes, so this did not work at first. If you are in the same boat, you need to add “<?php body_class(); ?>” (minus the quotations) to your starting body tag. So, for me, the starting body tag within the header.php code now reads “<body <?php body_class(); ?>>”. With that changed, body.home now selects the styling within my index.php page. That way, adding body.home .a2a_floating_style { display: none; } to my css hides the floating share buttons on my homepage.
