How to change settings in functions.php

I have created a child theme to TwentySixteen because I want to change the settings in one of the functions.

I found the ideas written in https://www.ads-software.com/support/topic/twenty-sixteen-size-logo/
and added this to the child functions.php

function add_stuff_to_theme() {

add_theme_support( 'custom-logo', array(
		'height'      => 630,
		'width'       => 1200,
		'flex-height' => true,
	) );
}

add_action( 'after_setup_theme', 'add_stuff_to_theme', 11 );

But it doesn’t work.

What can I do?