I got warning in my iphone that the wifi from my deco is considered weak security. As per link https://www.tp-link.com/id/support/faq/2943/?app=deco i suppose to change the security setting in my deco app in menu More >Wi-Fi Settings >Security to change the wireless security type, where the screenshot supposedly look like this:

However I cannot find the security setting there. Here is my screenshot:

Suspecting my deco app is not up-to-date I use menu More > System > Update Deco

So what should i do to change the security setting? note that my new notebook is limiting the internet speed when it runs on the network with old security.