WordPress at a glance
action is not described

edit_form_after_title action-hook . WP 1.0

This filter is documented in wp-admin/edit-form-advanced.php

Usage

add_action( 'edit_form_after_title', 'action_function_name_7195' );
function action_function_name_7195( $post ){
	// action...
}
$post
-

Where the hook is called

the_block_editor_meta_box_post_form_hidden_fields()
edit_form_after_title
wp-admin/includes/post.php 2432
do_action( 'edit_form_after_title', $post );
wp-admin/edit-form-advanced.php 579
do_action( 'edit_form_after_title', $post );

Where in WP core the hook is used WordPress

wp-admin/includes/post.php 80
add_action( 'edit_form_after_title', '_wp_posts_page_notice' );
wp-admin/includes/post.php 1459
add_action( 'edit_form_after_title', 'edit_form_image_editor' );