This Tampermonkey extension allows you to hide the recent chats in whatsapp web. This is very useful, for example if you are in a public place texting a friend. You can hide the recent chats with one click - so nobody watching your screen will see your private chats.
To install this tool, download Tampermonkey, and install it through this link: https://github.com/MoritzLaichner/whatsappweb-recent-chats-hider/raw/master/whatsappweb-recent-chats-hider.user.js
In this GIF I blurred the recent chats because of my privacy.