/**
 * Change the WP Page Template to Elementor Canvas with Post ID.
 */
function jkit_change_post_template() {
	/**
	 * Please enter the Post ID you want to change its Page Template to Elementor Canvas.
	 */
	$post_template_id = array( 11, 26 ); /** The Example is 11 and 26 */

	foreach ( $post_template_id as $id ) {
		$page_template = get_post_meta( $id, '_wp_page_template', true );
		$search_key    = 'elementor_';

		if ( strpos( $page_template, $search_key ) === false ) {
			update_post_meta( $id, '_wp_page_template', 'elementor_canvas' );
		}
	}
}
add_action( 'init', 'jkit_change_post_template' );