Change title tag

The title parameter lets you define a title to appear above the post listing. This uses the <h2> element by default.

[display-posts title="Recent Posts"]

You can use the display_posts_shortcode_title_tag filter to modify what heading is used. The code below changes this to an h4.

This code snippet goes in a core functionality plugin or Code Snippets.

Filters used:
display_posts_shortcode_title_tag