<?php // don't copy this line in your code

/**
 * Disable title on all post types.
 */
function your_prefix_post_title() {

	$post_types = array(
		'post',
		'page',
		'testimonials' // Add your post type slug's.
	);

	// bail early if the current post type if not the one we want to customize.
	if ( ! in_array( get_post_type(), $post_types ) ) {
		return;
	}

	// Disable Post featured image.
	add_filter( 'astra_the_title_enabled', '__return_false' );
}

add_action( 'wp', 'your_prefix_post_title' );