Remove excerpt function in "quote" Post format

I had been using the “Quote” format for the initial “sticky” post which had a full welcome to the site https://maine-src-dbvi.org/ (still in development). But the latest update to the WP Start Theme apparently changed this so that all of the formats show only a truncated version of each post. Any chance you can put it back to the way it was – for at least one of the formats to remove the excerpt function which truncates the post? I understand, my alternative is to create a child theme and edit the functions.php, but I would prefer not having to do all that if possible. Thanks!