How to Hide KissAi Widget Admin Menus

function plt_hide_kissai_menus() {
	//Hide "KissAi Admin".
	remove_menu_page('kissai-about');
	//Hide "KissAi Admin → About KissAi".
	remove_submenu_page('kissai-about', 'kissai-about');
	//Hide "KissAi Admin → Register".
	remove_submenu_page('kissai-about', 'kissai-plugin-register');
	//Hide "KissAi Admin → Settings".
	remove_submenu_page('kissai-about', 'kissai-plugin-settings');
	//Hide "KissAi Admin → Assistants".
	remove_submenu_page('kissai-about', 'kissai-assistants');
	//Hide "KissAi Admin → Training".
	remove_submenu_page('kissai-about', 'kissai-plugin-training');
	//Hide "KissAi Admin → Threads".
	remove_submenu_page('kissai-about', 'kissai_threads_page');
}

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