Google is testing a new privacy feature for Chrome on iOS, which lets you lock the incognito window behind the Face ID authentication.
The new feature will work like an app lock for incognito tabs, which will ask for Face ID authentication before reopening the tab. Without this feature enabled, there is no safety wall on your private tabs and anyone can easily open the sites you wanted no one to watch.
This feature is one extra security step to keep the snoopers away from your personal space on the internet (What data will be kept away from Google is a different story).
This feature is still under development but you can still use it if you want. you can enable it following these steps:
1. Open Chrome and type 'chrome://flags' in the address bar and press enter.
2.Now Search for 'Device Authentication for Incognito' and enable it.
3.Now Close and reopen Chrome.
4.Go into Settings then Privacy and you will see 'Lock Incognito Tabs When You Close Chrome', enable it.
Now every time, if someone tries to open the tabs in an incognito window they will be prompted to authenticate using Face ID. You can disable the feature by toggling off the 'Lock Incognito Tabs When You Close Chrome' which you enabled in the last step.