How to Hide the "Dashboard for Pressbooks and H5P" Admin Menu

function plt_hide_dashboard_for_pressbooks_h5p_menus() {
	//Hide the "Settings → Dashboard for Pressbooks and H5P" menu.
	remove_submenu_page('options-general.php', 'dashboard-for-pressbooks-h5p');
}

add_action('admin_menu', 'plt_hide_dashboard_for_pressbooks_h5p_menus', 11);

Where do I put this code?