How to Hide H5P Admin Menus

function plt_hide_h5p_menus() {
	//Hide "Settings → H5P".
	remove_submenu_page('options-general.php', 'h5p_settings');

	//Hide "H5P Content".
	remove_menu_page('h5p');
	//Hide "H5P Content → All H5P Content".
	remove_submenu_page('h5p', 'h5p');
	//Hide "H5P Content → Add New".
	remove_submenu_page('h5p', 'h5p_new');
	//Hide "H5P Content → Libraries".
	remove_submenu_page('h5p', 'h5p_libraries');
	//Hide "H5P Content → My Results".
	remove_submenu_page('h5p', 'h5p_results');
}

add_action('admin_menu', 'plt_hide_h5p_menus', 11);
Where do I put this code?