eliminate snippet-box from recent articles in home

I partially solved by changing the file functions.php
the code

return ( is_single() || is_page() ) ? $event : $content;

in

return ( is_single() ) ? $event : $content;

but in doing so the div is deleted on all pages of the site
and is only shown in the file single.php

I hope for a better solution, thanks

here is the alert message that appears after uploading an image
“NetworkError: 500 Internal Server Error – https://www.mysite.it/blog/wp-admin/async-upload.php”