The gazette theme shows a long paragraph under the article title

Hey there,

That is possible by adding excerpt to the content: https://en.support.wordpress.com/excerpts/ or you could add a more block into the content itself: https://en.support.wordpress.com/wordpress-editor/blocks/more-block/

It looks like this site is hosted with WordPress.com, so help with this theme can also be sort via https://wordpress.com/help/contact/

Thanks for your help, Adam! I’ll try these methods and post an update here.

Both of these methods worked! Thank you, Adam!