How to Hide Secure Custom Fields Admin Menus

function plt_hide_advanced_custom_fields_menus() {
	//Hide "SCF".
	remove_menu_page('edit.php?post_type=acf-field-group');
	//Hide "SCF → Field Groups".
	remove_submenu_page('edit.php?post_type=acf-field-group', 'edit.php?post_type=acf-field-group');
	//Hide "SCF → Post Types".
	remove_submenu_page('edit.php?post_type=acf-field-group', 'edit.php?post_type=acf-post-type');
	//Hide "SCF → Taxonomies".
	remove_submenu_page('edit.php?post_type=acf-field-group', 'edit.php?post_type=acf-taxonomy');
	//Hide "SCF → Tools".
	remove_submenu_page('edit.php?post_type=acf-field-group', 'acf-tools');
}

add_action('admin_menu', 'plt_hide_advanced_custom_fields_menus', 21);

Where do I put this code?