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New Samsung phones block sideloading by default
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
So you need to change two settings instead of one to side load. Seems rather pointless.
Big difference is that that one setting was shown to you with a button press when you tried to install an app. With this, you need to remember or make a screenshot of where you need to go, open the settings app and then go there and toggle it on. It's just a lot more annoying to do and Samsung probably hopes that that will deter people from doing it.
Screenshot? What are you, a goldfish?