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I acquired a S8+ earlier this week. One thing I noticed is when I enter my PIN, the number will only vanish after I hit the next number in the sequence. At best, a keen observer will only see the last number. At worst, someone will get my PIN by watching over my shoulder, etc..
Is there a fix for this behavior on the phone?
As pointed out by @user452820, there is a security setting in settings for that. Go to Settings > Lock screen and security > Other security settings and change the slider on Make passwords visible.
The blue slider should be greyed out to stop it.
You need to go to your phone's setting then find security. In security section look for password, find "show password" and turn it off. Sorry if I didn't say the exact place because I don't know how settings look like in your phone. But it's android and it means it should be there.
