Display featured image of post type category

The immediate answer to your question is that you can just add a category ID to the query_posts() call, e.g.:

query_posts('orderby=rand&showposts=1&post_type=gallery&cat=10');

Slightly longer answer is that it’s not a good idea to use query_posts in themes and plugins. More info in the docs here: https://developer.wordpress.org/reference/functions/query_posts/

You might want to take the opportunity to change the code to use get_posts or WP_Query, you just need to put the arguments in an array instead of a query string.

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