safari passwords are locked
On my MacBook Air, when I go to Safari > Preferences > Passwords. I am presented with this screen:
However, on my iMac I am presented with this screen:
I'm uncertain how I achieved this extra layer of security on my iMac and I'd like to replicate it on my Air but am unable to do so. The iMac locked passwords displayed above are better, I think, because then usernames and websites are also hidden.
Any idea or hints or clues would be appreciated.
Regards, Allan.
OBS,MacBook Air, iOS 10.1.1