How to Hide Gutentor - Gutenberg Blocks - Page Builder for Gutenberg Editor Admin Menus

function plt_hide_gutentor_menus() {
	//Hide "Gutentor".
	remove_menu_page('gutentor');
	//Hide "Gutentor → Getting Started".
	remove_submenu_page('gutentor', 'gutentor');
	//Hide "Gutentor → Blocks".
	remove_submenu_page('gutentor', 'gutentor-blocks');
	//Hide "Gutentor → Settings".
	remove_submenu_page('gutentor', 'gutentor-settings');
	//Hide "Gutentor → License".
	remove_submenu_page('gutentor', 'gutentor-pro-license');
}

add_action('admin_menu', 'plt_hide_gutentor_menus', 100);

Where do I put this code?