How to Hide Quill Forms Admin Menus

function plt_hide_quillforms_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "Quill Forms".
	remove_menu_page('quillforms');
	//Hide "Quill Forms → All Forms".
	remove_submenu_page('quillforms', 'quillforms');
	//Hide "Quill Forms → Addons".
	remove_submenu_page('quillforms', 'quillforms&path=addons');
	//Hide "Quill Forms → Settings".
	remove_submenu_page('quillforms', 'quillforms&path=settings');
	//Hide "Quill Forms → License".
	remove_submenu_page('quillforms', 'quillforms&path=license');
	//Hide "Quill Forms → System".
	remove_submenu_page('quillforms', 'quillforms&path=system');
	//Hide "Quill Forms → Import/Export".
	remove_submenu_page('quillforms', 'quillforms&path=import-export');
	//Hide "Quill Forms → Support".
	remove_submenu_page('quillforms', 'quillforms&path=support');
}

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

Where do I put this code?